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Q34.1
Which of the following changes its focal length
when it is immersed in water?
1. a concave mirror
2. a convex mirror
3. a diverging lens
4. all of the above
5. none of the above
A34.1
Which of the following changes its focal length
when it is immersed in water?
1. a concave mirror
2. a convex mirror
3. a diverging lens
4. all of the above
5. none of the above
Q34.2
A concave mirror with a radius of curvature of 20 cm
has a focal length of
1. 40 cm
2. 20 cm
3. 10 cm
4. 5 cm
5. answer depends on the index of refraction
of the air around the mirror
A34.2
A concave mirror with a radius of curvature of 20 cm
has a focal length of
1. 40 cm
2. 20 cm
3. 10 cm
4. 5 cm
5. answer depends on the index of refraction
of the air around the mirror
Q34.3
An object is placed 15 cm away from a concave mirror of
focal length +30 cm. The image formed by the mirror is
1. real and larger than the object
2. real and smaller than the object
3. real and the same size as the object
4. virtual and larger than the object
5. virtual and smaller than the object
A34.3
An object is placed 15 cm away from a concave mirror of
focal length +30 cm. The image formed by the mirror is
1. real and larger than the object
2. real and smaller than the object
3. real and the same size as the object
4. virtual and larger than the object
5. virtual and smaller than the object
Q34.4
A concave mirror forms a
real image of a lamp
filament.
If you use black paint to
cover the lower half of
the mirror, what part of
the filament will be
visible in the image?
1. only the upper half of the filament
2. only the lower half of the filament
3. only the left-hand half of the filament
4. only the right-hand half of the filament
5. the entire filament
A34.4
A concave mirror forms a
real image of a lamp
filament.
If you use black paint to
cover the lower half of
the mirror, what part of
the filament will be
visible in the image?
1. only the upper half of the filament
2. only the lower half of the filament
3. only the left-hand half of the filament
4. only the right-hand half of the filament
5. the entire filament
Q34.5
A thin lens has focal length f = –12 cm.
If an object 9 cm tall is placed 24 cm from the lens, what is
the height of the image?
1. 27 cm tall
2. 18 cm tall
3. 9 cm tall
4. 4.5 cm tall
5. 3 cm tall
A34.5
A thin lens has focal length f = –12 cm.
If an object 9 cm tall is placed 24 cm from the lens, what is
the height of the image?
1. 27 cm tall
2. 18 cm tall
3. 9 cm tall
4. 4.5 cm tall
5. 3 cm tall
Q34.6
Which statement is true about a farsighted (hyperopic) eye?
1. the image point is in front of the retina;
a converging eyeglass lens is used to correct this condition
2. the image point is in front of the retina;
a diverging eyeglass lens is used to correct this condition
3. the image point is behind the retina;
a converging eyeglass lens is used to correct this condition
4. the image point is behind the retina;
a diverging eyeglass lens is used to correct this condition
A34.6
Which statement is true about a farsighted (hyperopic) eye?
1. the image point is in front of the retina;
a converging eyeglass lens is used to correct this condition
2. the image point is in front of the retina;
a diverging eyeglass lens is used to correct this condition
3. the image point is behind the retina;
a converging eyeglass lens is used to correct this condition
4. the image point is behind the retina;
a diverging eyeglass lens is used to correct this condition
Q34.7
You are choosing lenses for a telescope that you will use to
look at the Moon and planets. You should select
1. an objective lens with a long focal length
and an eyepiece lens with an even longer focal length
2. an objective lens with a long focal length
and an eyepiece lens with a shorter focal length
3. an objective lens with a short focal length
and an eyepiece lens with a longer focal length
4. an objective lens with a short focal length
and an eyepiece lens with an even shorter focal length
A34.7
You are choosing lenses for a telescope that you will use to
look at the Moon and planets. You should select
1. an objective lens with a long focal length
and an eyepiece lens with an even longer focal length
2. an objective lens with a long focal length
and an eyepiece lens with a shorter focal length
3. an objective lens with a short focal length
and an eyepiece lens with a longer focal length
4. an objective lens with a short focal length
and an eyepiece lens with an even shorter focal length
Q34.8
You are designing a telescope that will use a single lens.
The purpose of the telescope is to take photographs of the Moon.
The linear magnification m of the image will be in the range
1. m > 1
2. 0 < m < 1
3. –1 < m < 0
4. m < –1
A34.8
You are designing a telescope that will use a single lens.
The purpose of the telescope is to take photographs of the Moon.
The linear magnification m of the image will be in the range
1. m > 1
2. 0 < m < 1
3. –1 < m < 0
4. m < –1