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PHYS-104, COLLEGE PHYSICS
Behavioral Objectives - Unit IV(b)
Mirrors and Lenses
C
A.
In relation to concave and convex mirrors, be able to:
a.
b.
c.
O
d.
e.
C
B.
draw a ray diagram for an image given the object distance
and focal length of the mirror.
identify the image’s character, i.e. relative size,
whether real or virtual, whether erect or inverted.
identify the outcome of a practical situation using each
type or mirror, apply the mirror equation to solve for
the
object distance, image distance, and/or focal point
(radius of curvature) in terms of the other two.
solve for the image size, object size, image distance
and/or object distance in terms of the others.
using information in (d), solve for magnification.
In relation to converging and diverging lens, be able to:
a.
b.
O
c.
d.
e.
f.
identify the distinguishing characteristics of each and
apply to a practical situation, i.e. effect on parallel
light rays, thickness in the center, sign convention,
etc.
draw a ray diagram for an image given the object’s
distance and focal length of the lens and describe
the image’s character, i.e. relative size, erect or
inverted, real or virtual.
using the lens equation, solve for the object distance,
image distance and/or focal length (radius) in terms of
the other two variables.
solve for the image size, object size, image distance, or
object distance in terms of the others.
solve for the magnification using the information in (d).
identify the basic principles of how a microscope
magnifies light, solve for the magnification knowing me
and mo, plus apply to explain a practical example.
C
C.
Be able to identify an example of, the cause of, and the
correction for the lens defects of chromatic aberrations and
spherical aberrations (also for mirrors).
Laboratory Objectives
A.
Given a concave and convex mirror, be able to (within 10% error):
(a) find its focal length (concave only) using the optical bench
method.
(b) find its image distance experimentally and using the mirror
equation for a given object.
(c) describe the resulting image’s characteristics.
(d) draw the appropriate ray diagrams to scale.
- 2 -
B.
Given a converging or diverging lens, be able to:
(a) find its focal length using the optical bench method
(converging only).
(b) find its image distance both experimentally and using the lens
equation for a given object distance.
(c) draw a ray diagram depicting the situation in (b) and describe
the resulting image’s characteristics, i.e. size, real or
virtual, upright or inverted, sides reversed or not.
Learning Activities for Lenses and Mirrors
Read:
College Physics, 9th ed., Serway, Chapter 23, pps. 790-800, 804811, 814, and 866-868.
College Physics (Schaum’s Outline, 11th ed.), pps. 391-398, 409413, 418-422(pp. 348-354, 364-368, 372-376 in 10th ed)
Optional:
Conceptual Physics, Hewitt, pp. 533-534, 546-551 in 10th ed. (pp.
551-557 in 9th ed.) on reserve in Library.
www.physicsclassroom.com/class/refrn/u14L5a.html
www.physicsclassroom.com/class/refln/u13L3a.html
www.ionaphysics.org/lab/Demoes.htm (look for Thin Lens and Mirror
Demos)
www.walter-fendt.de/ph14e Image Formation by Converging Lenses
Homework:
Chapter 23, M-C Q’s 1, 9 & 10; Concept Q’s 2 & 15
Problems 7, 31 add case for p = 30 cm and draw ray diagrams for each,
33(i)&(iii) & add draw ray diagrams, plus Extra(not starred)
1.
A butterfly is 20 cm in front of a concave mirror which has a focal
length of 40 cm. Find: a. the location of the image.
b.
Is the image larger or smaller than the butterfly and
calculate its relative size?
c.
Describe the image characteristics: erect or inverted, real
or virtual?
2.
A peanut is 50 cm in front of mirror in #1. Answer same questions
for the peanut’s image.
3.
A button is 100 cm in front of the mirror in #1. Answer same
questions for button’s image.
ANSWERS TO EXTRA EXERCISES:
Extra 1. q = - 40 cm, M = 2X, virtual, erect & larger
Extra 2.
q = 200 cm, M = -4X, real, inverted & larger
Extra 3.
q = 66.7 cm, M = -0.667, real, inverted & smaller
Laboratory:
Curved Mirrors and Thin Lenses; Optics of the Human Eye (read pp. 860-864)
*Optional