Physics 222 Worksheet: Chapter 25, Optical Instruments

1) The image formed on the retina of the eye is

a) real, inverted, and enlarged

b) real, inverted and reduced in size

c) virtual, inverted and reduced in size

d) virtual, erect and reduced in size

2) The eye focuses on objects at different distances by

a) changing the thickness of the lens

b) changing the distance from the lens to the retina

c) changing the index of refraction of the lens

d) changing the size of the iris

3) The eye adjusts for different light levels by

a) changing the thickness of the lens

b) changing the distance from the lens to the retina

c) changing the index of refraction of the lens

d) changing the size of the iris

4) A compound microscope is composed of

a) two converging lenses that produce a final image that is virtual, erect and enlarged

b) two converging lenses that produce a final image that is real, erect and enlarged

c) two diverging lenses that produce a final image that is virtual, erect and enlarged

d) two converging lenses that produce a final image that is virtual, inverted and enlarged

e) two diverging lenses that produce a final image that is virtual, inverted and enlarged

5) The eye defect in which the image is focused behind the retina is called

a) myopia, and is corrected by eyeglasses containing converging lenses

b) myopia, and is corrected by eyeglasses containing diverging lenses

c) hyperopia, and is corrected by eyeglasses containing converging lenses

d) hyperopia, and is corrected by eyeglasses containing diverging lenses

6) A person has a near point of 110 cm and a far point of infinity. This person

a) is nearsighted

b) is farsighted

c) has astigmatism

7) The lens defect in which light of different wavelengths does not come to the same focus is

a) chromatic aberration

b) spherical aberration

c) astigmatism

d) distortion

8) Large telescopes usually make use of a

a) converging lens

b) diverging lens

c) convex mirror

d) concave mirror

Ans: 1-b, 2-a, 3-d, 4-d, 5-c, 6-b, 7-a, 8-d