Waves Practice Problem Set Worksheet Page 25
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ECHANICS
RACTICE
ROBLEM
ETS
c. What would be the refracted angle if the ray entered the water directly?
Answer: 31.2°
5. (G41) The critical angle for a certain liquid-air surface is 44.7°. What is the index of
refraction of the liquid?
Answer: 1.42
6. (G49) Sunlight is observed to focus at a point 18.5 cm behind a lens.
a. What kind of lens is it?
b. What is its power in diopters?
Answer: 5.41 D
7. (G50) A certain lens focuses an object 2.25 m away as an image 48.3 cm on the other
side of the lens. What type of lens is it and what is its focal length? Answer: 0.13 m
a. What is the magnification of the image?
Answer: 0.13 m
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8. (G53) The Sun’s diameter is 1.4 x 10
km and it is 1.5 x 10
km away. How large is
the image of the Sun on the film used in a camera with…
a. a 28-mm focal length lens?
Answer: -0.26 mm
b. a 50-mm focal length lens?
Answer: -0.47 mm
c. a 200-mm focal length lens?
Answer: -1.9 mm
9. (G55) A -6.0 diopter is held 14.0 cm from an ant 1.0 mm high. What is the position,
type, and height of the image?
Answer: -7.6 cm, 0.54 mm
10. (G57) How far from a 50.0 mm focal length lens must an object be placed if its
image is to be magnified 2.00x and be real?
Answer: 75.0 mm
a. What if its image is to be virtual and magnified 2.00x? Answer: 25.0 mm
Gamzon & Gregorian-Michaelsen
6/7/16
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