Download CE-PHY II - OPTICS

HKCEE 1990 – 1998
PHYSIC – Multiple Choices
Optics
(90-CE-PHY II - 11)
11.
What happens to the wavelength and frequency of a ray of light if it passes from water into air ?
Wavelength
Frequency
A.
increases
decreases
B.
decreases
remains unchanged
C.
remains unchanged
increases
D.
increases
remains unchanged
E.
remains unchanged
remains unchanged
(90-CE-PHY II - 12)
12.
Which of the following arrangements will enable an image of the object PQ to be formed on a
screen ?
(1)
(2)
(3)
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
E.
(1), (2) and (3)
(90-CE-PHY II - 13)
13.
A fixed concave mirror is used to form a real, inverted and diminished image of an object on a
screen. If the screen is moved slightly away from the mirror, how should the object be moved in
order to form a sharp image on the screen again ? What is the change in magnification of the
image ?
Movement of the object
Magnification
A.
towards the mirror
increases
B.
towards the mirror
decreases
C.
away from the mirror
increases
D.
away from the mirror
decreases
E.
away from the mirror
no change
(90-CE-PHY II - 14)
14.
If F, F' are foci and C, C' are both at a distance of two times the focal length from the lens,
which of the following ray diagrams is/are correct ?
(1)
(2)
(3)
A.
(1) only
B.
(3) only
C.
(1) and (2) only
D.
(2) and (3) only
E.
(1), (2) and (3)
(90-CE-PHY II - 15)
15.
A convex lens is used as a magnifying glass to read some small print in a book. Which of the
following statements is/are true ?
(1)
The image distance is greater than the object distance.
(2)
The image of the print is real.
(3)
The image of the print is erect.
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
E.
(1), (2) and (3)
(90-CE-PHY II - 16)
16.
Which of the following diagrams correctly shows how shortsightedness is
corrected by a
lens ?
A.
B.
C.
D.
E.
(91-CE-PHY II - 12)
12.
Which of the following statements concerning the properties of virtual images is/are correct ?
(1)
Virtual images can be seen by the eye.
(2)
Virtual images can be formed on a screen.
(3)
Virtual images can be photographed with a camera.
A.
(1) only
B.
(2) only
C.
(3) only
D.
(1) and (3) only
E.
(2) and (3) only
(91-CE-PHY II - 13)
13.
In the above diagram, the image I of an object O is produced by a lens. What is the nature and
position of this lens ?
A.
convex and placed at A
B.
concave and placed at B
C.
concave and placed at C
D.
concave and placed at D
E.
convex and placed at E
(91-CE-PHY II - 14)
14.
If F and C are the focus and the centre of curvature of the concave mirror respectively, which of
the following ray diagrams is correct ?
A.
B.
C.
D.
E.
(91-CE-PHY II - 15)
15.
In the figure above, F is the focus of the converging lens. Which of the five rays is
INCORRECTLY drawn ?
A.
P
B.
Q
C.
R
D.
S
E.
T
(92-CE-PHY II - 14)
14.
A rear-view driving mirror may be either plane or convex. Which of the following is/ace the
advantage(s) of using a convex mirror over a plane mirror ?
(1)
A convex mirror produces an erect image.
(2)
A convex mirror produces a virtual image.
(3)
A convex mirror provides a wider field of vision.
A.
(1) only
B.
(3) only
C.
(1) and (2) only
D.
(2) and (3) only
E.
(1), (2) and (3)
(92-CE-PHY II - 15)
15.
The above diagram shows the reflection of two parallel light rays at a concave mirror. PA is the
principal axis of the mirror. What is the radius of curvature of the mirror ?
A.
5 cm
B.
10 cm
C.
20 cm
D.
25 cm
E.
50 cm
(92-CE-PHY II - 16)
16.
In which of the above cases ?
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
E.
(1), (2) and (3)
(93-CE-PHY II - 9)
9.
The image of an object formed by an optical device is always virtual, erect and of the same size
as the object. The optical device is
A.
a convex lens.
B.
a concave lens.
C.
a convex mirror.
D.
a concave mirror.
E.
a plane mirror.
(93-CE-PHY II - 10)
10.
If F and C are the focus and centre of curvature of the convex mirror respectively, which of the
following ray diagrams is correct ?
A.
B.
C.
D.
E.
(93-CE-PHY II - 11)
11.
Which of the following phenomena is/are caused by refraction of light ?
(1)
A swimming pool appears shallower than it really is.
(2)
A metre rule appears bent when dipped in water.
(3)
A spectrum is formed when white light passes through a prism
A.
(1) only
B.
(3) only
C.
(1) and (2) only
D.
(2) and (3) only
E.
(1), (2) and (3)
(93-CE-PHY II - 12)
12.
A lens is used to look at some print on a paper. The image of the word "PHYSICS" is shown
above. Which of the following statements is/are true ?
(1)
The lens is a converging lens.
(2)
The image lies between the paper and the lens.
(3)
The image is real.
A.
(2) only
B.
(3) only
C.
(1) and (2) only
D.
(1) and (3) only
E.
(1), (2) and (3)
(93-CE-PHY II - 13)
13.
The above diagram shows a light ray travelling from liquid to air. Find the refractive index of
the liquid.
A.
0.71
B.
0.75
C.
1.33
D.
1.41
E.
1.50
(93-CE-PHY II - 14)
14.
A man uses his spectacles to focus sunlight on a paper and set it on fire. What kind of spectacles
does he wear and what defect of vision does he have?
Spectacles
Defect of vision
A.
Converging lens
short-sighted
B.
Converging lens
long-sighted
C.
Diverging lens
short-sighted
D.
Diverging lens
long-sighted
E.
Sun-glasses
no defect
(93-CE-PHY II - 15)
15.
A microscope is used to view a small object. Which of the following statements is/are true ?
(1)
The objective and the eyepiece of the microscope are convex lenses.
(2)
The image formed by the objective is real.
(3)
The image formed by the eyepiece is magnified.
A.
(2) only
B.
(3) only
C.
(1) and (2) only
D.
(1) and (3only
E.
(1), (2) and (3)
(94-CE-PHY II - 11)
11.
Which of the following statements concerning real images is/are correct ?
(1)
Real images are always diminished.
(2)
Real images can be photographed with a camera.
(3)
Without a screen, real images cannot be seen by the eye.
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
E.
(1), (2) and (3)
(94-CE-PHY II - 13)
13.
Which of the following devices involve(s) total internal reflection of light as they work ?
(1)
Optical fibres
(2)
A prismatic periscope
(3)
A microscope
A.
(2) only
B.
(3) only
C.
(1) and (2) only
D.
(1) and (3) only
E.
(1), (2) and (3)
(94-CE-PHY II - 14)
14.
A ray of light travels in air and strikes a semi-circular glass block at an angle of incidence 42.
The critical angle of the glass is 42. Which of the following diagrams best shows the
subsequent path(s) of the ray ?
A.
B.
C.
D.
E.
(94-CE-PHY II - 15)
15.
In the above diagram, the image I of an object O is produced by a concave mirror. What should
the positions of this mirror and its principal focus be ?
Position of mirror
Position of principal focus
A.
Q
P
B.
R
P
C.
R
Q
D.
S
R
E.
T
S
(95-CE-PHY II - 13)
13.
A magnifying glass is used to read some small print in a book. The glass is placed 3 cm from the
book and the magnification is 3. What is the distance between the book and the image of the
print ?
A.
1 cm
B.
3 cm
C.
6 cm
D.
9 cm
E.
12 cm
(95-CE-PHY II - 14)
14.
Which of the following ray diagrams correctly shows the working principle of a prismatic
periscope ?
A.
B.
C.
D.
E.
(95-CE-PHY II - 15)
15.
An object O forms an image I in a convex mirror. The above diagram shows how two rays from
the top of the object are reflected by the mirror. Which of the following distances denotes the
focal length of the mirror ?
A.
S
B.
T
C.
R
D.
QS
E.
QT
(95-CE-PHY II - 16)
16
n the above diagram, F, F' are the foci of the convex lens and AB is an incident ray. Which of the
following paths best represents the emergent ray ?
A.
P
B.
Q
C.
R
D.
S
E.
T
(95-CE-PHY II - 17)
17.
The above diagram shows the image formation of a distant object by an eye. Which of the
following statements is true ?
A.
The eye is short-sighted and can be corrected by a diverging lens.
B.
The eye is short-sighted and can be corrected by a converging lens.
C.
The eye is long-sighted and can be corrected by a diverging lens.
D.
The eye is long-sighted and can be corrected by a converging lens.
E.
The eye is normal.
(1996-CE-PHY II - 11)
11.
An object is placed in front of a concave mirror as shown above, where F denotes the
focus of the mirror. Which of the following correctly describes the nature of the image
formed ?
A.
real, inverted and diminished
B.
real, inverted and magnified
C.
virtual, inverted and magnified
D.
virtual, erect and diminished
E.
virtual, erect and magnified
(1996-CE-PHY II - 12)
12.
If f denotes the focal length of the above convex mirror, which of the following ray
diagrams is correct ?
A.
B.
C.
D.
E.
(1996-CE-PHY II - 13)
13.
Which of the following is not a correct application of the corresponding optical device?
Optical device
Application
A.
Concave mirrors
Shaving mirrors
B.
Convex mirrors
Rear-view driving mirrors
C.
Concave lenses
Spectacles for correcting long sight
D.
Convex lenses
Magnifying glasses
E.
Triangular glass prisms Periscopes
(1996-CE-PHY II - 14)
14.
A ray of red light travels in air and strikes a triangular glass prism at an angle of
incidence 45. The critical angle of red light for the glass is 42. Which of the
following diagrams best shows the path of the ray?
A.
B.
C.
D.
E.
(1996-CE-PHY II - 15)
15.
When an object O is placed in front of a convex lens and a plane mirror as shown
above, an image I is formed at the same position as the object. Which of the following
statements is/are correct ?
(1)
The image I is real.
(2)
The focal length of the lens is 10 cm.
(3)
If the distance between the lens and the plane mirror is changed to 2 cm, the
position of the image I remains unchanged.
A.
(1) only
B.
(3) only
C.
(1) and (2) only
D.
(2) and (3) only
E.
(1), (2) and (3)
(1996-CE-PHY II - 17)
17.
A ray of light travelling in air enters a semi-circular glass block as shown above.
Different values of the angle of incidence  and the corresponding values of the angle
of refraction  are measured. Which of the following expressions represents the
refractive index of the glass ?
A.
the slope of the graph of sin  against sin 
B.
the slope of the graph of sin  against sin 
C.
the slope of the graph of  against 
D.
the slope of the graph of  against 
E.
the value of sin  when B = 90
(1997-CE-PHY II - 11)
11.
Which of the following correctly describes the nature of the image of an object formed
by a convex mirror ?
A.
virtual, diminished and formed between the mirror and the principal focus
B.
virtual, diminished and formed between the object and the mirror
C.
virtual, magnified and formed between the principal focus and the centre
of curvature
D.
real, diminished and formed between the mirror and the principal focus
E.
real, magnified and formed between the principal focus and the centre of
curvature
(1997-CE-PHY II - 12)
12.
In the above diagram. A'B' is the image of an object AB formed by an optical device PQ.
What is PQ ?
A.
a concave mirror
B.
a convex mirror
C.
a plane mirror
D.
a concave lens
E.
a convex lens
(1997-CE-PHY II - 13)
13.
In the above diagram, the image I of an object O is produced by a concave mirror.
Where should the positions of the mirror and its principal focus be ?
Position of mirror
Position of principal focus
A.
P
Q
B.
P
R
C.
Q
R
D.
R
S
E.
R
Q
(1997-CE-PHY II - 14)
14.
Which of the following is/are correct application(s) of concave mirrors ?
(1)
Shaving mirrors
(2)
Rear-view driving mirrors
(3)
Reflectors for car headlights
A.
(2) only
B.
(3) only
C.
(1) and (2) only
D.
(1) and (3) only
E.
(1), (2) and (3)
(1997-CE-PHY II - 15)
15.
Which of the following phenomena involve(s) total internal reflection of light?
(1)
The sparkling of a diamond.
(2)
The formation of a mirage.
(3)
A ruler appearing bent when dipped in water.
A.
(2) only
B.
(3) only
C.
(1) and (2) only
D.
(1) and (3) only
E.
(1), (2) and (3)
(1997-CE-PHY II - 16)
16.
Which of the following statements concerning a long-sighted eye is/are correct ?
(1)
It can be corrected by a convex lens.
(2)
The distance between the eye and its near point is longer than that of a normal
eye.
(3)
The image of an object placed close to the eye is formed in front of the retina.
A.
(1) only
B.
(3) only
C.
(1) and (2) only
D.
(2) and (3) only
E.
(1), (2) and (3)
(1998-CE-PHY II - 13)
13.
An object is placed x cm in front of a concave mirror and a real image is formed
y cm in front of the mirror as shown above. If the object is now placed y cm in
front of the mirror, which of the following statements is/are correct ?
(1)
The new image is virtual.
(2)
The new image is formed at a distance x cm in front of the mirror.
(3)
The magnification of the new image is
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
E.
(1), (2) and (3)
x
y
(1998-CE-PHY II - 14)
14.
A magnifying glass is used to read some small print in a book. Which of the following
statements is correct ?
A.
The magnifying glass is a concave lens.
B.
The image of the small print is real.
C.
The object distance is greater than the focal length of the glass.
D.
The image distance is shorter than the object distance.
E.
The small print and its image are on the same side of the glass.
(1998-CE-PHY II - 15)
15.
If F and F´ are the foci of the concave lens, which of the following ray diagrams is
incorrect ?
A.
B.
C.
D.
E.
(1998-CE-PHY II - 16)
16.
A beam consisting of read and violet light travels in a glass block with an air
cavity. The cavity is in the shape of a prism as shown above. Which of the
following diagrams best shows the subsequent path of the beam ?
A.
B.
C.
D.
E.
(1998-CE-PHY II - 17)
17.
Which of the following cannot be an application of the corresponding optical device ?
Optical device
Application
A.
Converging lenses
Spectacles for correcting short sight
B.
Triangular prisms
Binoculars
C.
Convex mirrors
Rear view driving mirrors
D.
Concave mirrors
Reflectors for car headlights
E.
Plane mirrors
Periscopes
(1998-CE-PHY II - 18)
18.
Which of the following phenomena is/are caused by the refraction of light?
(1)
If a man who is spear-fishing aims his spear at where the fish appears to be, he
will miss it.
(2)
A spectrum is formed when white light passes through a prism.
(3)
A light ray is transmitted through a curved glass fibre.
A.
(1) only
B.
(3) only
C.
(1) and (2) only
D.
(2) and (3) only
E.
(1), (2) and (3)