Physics Light Review Problems

2009

#1

The tallest man in history was 2.72 m tall. The smallest woman in history had a height of 0.55 m. Suppose Robert is standing 5.0 m from a converging mirror that produces an image equal to Pauline’s height, what is the focal length of this mirror?

#2

A human hair is about 0.0080 cm thick. If one places the hair 2.40 cm from a concave mirror with a focal length of 2.50 cm, how thick will the image of the hair appear?

#3

A steel ball bearing with a radius of 1.5 cm forms an image of an object that has been placed 1.1 cm away from the bearing’s surface. Determine the image distance and magnification.

#4

A spherical mirror is to be used in a motion-picture projector to from an inverted, real image 95 times as tall as the picture in a single frame of file. The image is projected onto a screen 13 m from the mirror. What type of mirror is required, and how far should it be from the film?

#5

Consider a concave spherical mirror and an object. Is the image always inverted? Is the image always real? Give conditions for your answers.

#6

The reflector of a radio telescope has a radius of curvature of 265.0 m. How far above the reflector must the radio-detecting equipment be placed in order to obtain clear radio images?

#7

Describe the three rays used to predict image location in curved mirrors.

#8

The real image of a tree is magnified -0.085 times by a telescope’s primary mirror. If the tree’s image forms 35 cm in front of the mirror, what is the distance between the mirror and the tree?

#9

The real image of a tree is magnified -0.085 times by a telescope’s primary mirror. If the tree’s image forms 35 cm in front of the mirror, what is the focal length of the mirror?

#10*

A child holds a candy bar 15.5 cm in front of the convex side-view mirror of an automobile. The image height is reduced by one-half. What is the radius of curvature of the mirror?

#11

What could you do to determine if an image is real or virtual?

#12

What happens to a narrow light beam that enters parallel to the principal axis of a spherical concave mirror?

#13

What happens to a narrow light beam that passes through the focal point of a concave mirror before being reflected?

#14

If a vehicle 2.0 m high is 4.6 m from a car’s convex mirror, find the position and height of the image, given that the radius of curvature is 0.80 m.

#15

Which of the following does not refer to a type of electromagnetic wave?

A. radio B. sonar C. ultraviolet

D. X-ray E. microwave F. gamma

#16The wavelength of red light is _?_ that

of blue light; the frequency of red light is _?_ that of blue light.

A. longer than; higher than B. shorter than; lower than C. longer than; lower thanD. longer than; the same as E. the same as; higher than F. none of these

#17From lowest to highest frequency, these would

be orderedA. R-IR-UV-γ B. IR-R-UV-γ C. γ-IR-UV-R D. UV-IR-γ-RE. IR-γ-R-UV F. γ-UV-IR-R G. R-UV-γ-IR H. UV-R-IR-γ

#18

Which station broadcasts with 2.94m radio waves?

A. KXPR 91.7MHz B. Y 92.5MHz C. WGRD 98.5MHzD. KSFM 102MHz E. KWOD 106MHz F. WLAV 108MHz

#19

A thimble is 32.0 cm from a concave mirror. The focal point of the mirror is 11.0 cm. What is the magnification of the image?

#20

A child who is 1.1 m tall is standing 6.0 m from a convex mirror. The child’s image is 0.40 m behind the mirror. What is the size of the image?

#21

What does negative value of focal length tell you about a mirror?

What does a negative image distance tell you about an image?

#22

Describe how an image would change as an object is moved from very far away towards the surface of a concave mirror.

#23

What does the law of reflection state?

#24

Which color of the visible light portion of the electromagnetic spectrum has the highest frequency?

Most energy? Longest wavelength?

#25

A laser pointer emits light waves with a wavelength of 533 nm. What is the frequency of this light?