Question 1

When an object is 12 cm in front of a concave mirror,the image is 3.0 cm in front of the mirror? What is the focal length of the mirror?

Accepted Answer

A) -0.25 cm 
B) 15 cm 
C) 4.0 cm 
D) 2.4 cm 
E) -1.3 cm 
A) -0.25 cm 
B) 15 cm 
C) 4.0 cm 
D) 2.4 cm 
E) -1.3 cm D

Question 2

A beam of light that is parallel to the principal axis strikes a convex mirror.What happens to the reflected beam of light?

Accepted Answer

A) It also is parallel to the principal axis. 
B) It is perpendicular to the principal axis. 
C) It appears to be coming from the focal point on the other side of the mirror. 
D) It appears to be coming from the center of curvature of the mirror. 
E) It appears to be coming from a point between the focal point and the center of curvature of the mirror. 
A) It also is parallel to the principal axis. 
B) It is perpendicular to the principal axis. 
C) It appears to be coming from the focal point on the other side of the mirror. 
D) It appears to be coming from the center of curvature of the mirror. 
E) It appears to be coming from a point between the focal point and the center of curvature of the mirror. C

Question 3

The focal length of a convex mirror is has a magnitude of 20 cm.What is its radius of curvature?

Accepted Answer

A) -10 cm 
B) 40 cm 
C) -40 cm 
D) -20 cm 
E) 20 cm 
A) -10 cm 
B) 40 cm 
C) -40 cm 
D) -20 cm 
E) 20 cm C

Question 4

A glass plate with an index of refraction is 1.57 is immersed in an oil having a refractive index of 1.40.The surface of the glass is inclined at an angle of 54° with the vertical.A horizontal light ray in the glass strikes the interface.What is the angle that the refracted ray,in the oil,makes with the horizontal?

Accepted Answer

A) 11° 
B) 5.6° 
C) 8.3° 
D) 14° 
E) 17° 
A) 11° 
B) 5.6° 
C) 8.3° 
D) 14° 
E) 17°

Question 5

A laser beam strikes a plane mirror's reflecting surface with an angle of incidence of 43°.What is the angle between the incident ray and the reflected ray?

Accepted Answer

A) 43° 
B) 86° 
C) 45° 
D) 90° 
E) 0° 
A) 43° 
B) 86° 
C) 45° 
D) 90° 
E) 0°

Question 6

The critical angle for a beam of light passing from water into air is 48.8°.This means that all light rays with an angle of incidence in the water that is greater than 48.8° will be

Accepted Answer

A) totally absorbed by the water. 
B) totally reflected. 
C) partially reflected and partially transmitted. 
D) totally transmitted. 
A) totally absorbed by the water. 
B) totally reflected. 
C) partially reflected and partially transmitted. 
D) totally transmitted.

Question 7

When an object is 12 cm in front of a concave spherical mirror,the image is formed 3.0 cm in front of the mirror.What is the focal length of the mirror?

Accepted Answer

A) 15 cm 
B) 4.0 cm 
C) 2.4 cm 
D) 1.3 cm 
A) 15 cm 
B) 4.0 cm 
C) 2.4 cm 
D) 1.3 cm

Question 8

A 4.0-cm-tall object is placed 50.0 cm from a diverging lens having a focal length of magnitude 25.0 cm.What is the nature and location of the image?

Accepted Answer

A) a real image,4.0 cm tall,20 cm other side of the object 
B) a virtual image,4.0 cm tall,20 cm other side of the object 
C) a virtual image,2.0 cm tall,10 cm other side of the object 
D) a virtual image,1.3 cm tall,16.7 cm same side as the object 
E) a real image,1.3 cm tall,16.7 cm same side as the object 
A) a real image,4.0 cm tall,20 cm other side of the object 
B) a virtual image,4.0 cm tall,20 cm other side of the object 
C) a virtual image,2.0 cm tall,10 cm other side of the object 
D) a virtual image,1.3 cm tall,16.7 cm same side as the object 
E) a real image,1.3 cm tall,16.7 cm same side as the object

Question 9

Light travels from crown glass,with a refractive index of 1.52,into water,having a refractive index of 1.33? The critical angle for this interface is closest to which one of the following angles?

Accepted Answer

A) 42° 
B) 48° 
C) 53° 
D) 57° 
E) 61° 
A) 42° 
B) 48° 
C) 53° 
D) 57° 
E) 61°

Question 10

A person jogs toward a plane mirror at a speed of 3 m/s.How fast is he approaching his image in the mirror?

Accepted Answer

A) 1 5 m/s 
B) 3 m/s 
C) 4 m/s 
D) 5 m/s 
E) 6 m/s 
A) 1 5 m/s 
B) 3 m/s 
C) 4 m/s 
D) 5 m/s 
E) 6 m/s

Question 11

If a object is placed between a convex lens and its focal point,the image formed is

Accepted Answer

A) virtual and upright. 
B) virtual and inverted. 
C) real and upright. 
D) real and inverted. 
A) virtual and upright. 
B) virtual and inverted. 
C) real and upright. 
D) real and inverted.

Question 12

Sometimes when you look into a curved mirror you see a magnified image (a great big you)and sometimes you see a diminished image (a little you).If you look at the bottom (convex)side of a shiny spoon,what will you see?

Accepted Answer

A) You won't see an image of yourself because no image will be formed. 
B) You will see a little you,upside down. 
C) You will see a little you,right side up. 
D) You will see a little you,but whether you are right side up or upside down depends on how near you are to the spoon. 
E) You will either see a little you or a great big you,depending on how near you are to the spoon. 
A) You won't see an image of yourself because no image will be formed. 
B) You will see a little you,upside down. 
C) You will see a little you,right side up. 
D) You will see a little you,but whether you are right side up or upside down depends on how near you are to the spoon. 
E) You will either see a little you or a great big you,depending on how near you are to the spoon.

Question 13

A beam of light,traveling in air,strikes a plate of transparent material at an angle of incidence of 56.0°.It is observed that the reflected and refracted beams form an angle of 90.0°.What is the index of refraction of this material?

Accepted Answer

A) 1.40 
B) 1.43 
C) 1.44 
D) 1.48 
A) 1.40 
B) 1.43 
C) 1.44 
D) 1.48

Question 14

A beam of light traveling in air strikes a slab of transparent material.The incident beam makes an angle of 40° with the normal,and the refracted beam make an angle of 26° with the normal.What is the speed of light in the transparent material? (c = 3.0 × 108 m/s)

Accepted Answer

A) 1.0 × 108 m/s 
B) 2.0 × 108 m/s 
C) 2.3 × 108 m/s 
D) 3.0 × 108 m/s 
E) 0.50 × 108 m/s 
A) 1.0 × 108 m/s 
B) 2.0 × 108 m/s 
C) 2.3 × 108 m/s 
D) 3.0 × 108 m/s 
E) 0.50 × 108 m/s

Question 15

Starting from very far away,an object is moved closer and closer to a diverging lens,eventually reaching the lens.What happens to its image formed by that lens? (There could be more than one correct choice. )

Accepted Answer

A) The image gets closer and closer to the lens. 
B) The image gets farther and farther from the lens. 
C) The image always remains virtual. 
D) The image eventually changes from real to virtual. 
E) The image keeps getting larger and larger. 
A) The image gets closer and closer to the lens. 
B) The image gets farther and farther from the lens. 
C) The image always remains virtual. 
D) The image eventually changes from real to virtual. 
E) The image keeps getting larger and larger.

Question 16

An object is 50 cm from a concave mirror with radius of curvature of magnitude 60 cm.What is the lateral magnification produced by the mirror?

Accepted Answer

A) +0.40 
B) +0.70 
C) +1.5 
D) -0.70 
E) -1.5 
A) +0.40 
B) +0.70 
C) +1.5 
D) -0.70 
E) -1.5

Question 17

A convex mirror has a focal length of magnitude f.An object is placed in front of this mirror at a point  
F from the face of the mirror.The image will appear

Accepted Answer

A) behind the mirror. 
B) upright and reduced. 
C) upright and enlarged. 
D) inverted and reduced. 
E) inverted and enlarged. 
A) behind the mirror. 
B) upright and reduced. 
C) upright and enlarged. 
D) inverted and reduced. 
E) inverted and enlarged.

Question 18

Which of the following terms describe lenses that are thicker at the center than at the edges? (There could be more than one correct choice. )

Accepted Answer

A) converging lenses 
B) diverging lenses 
C) concave lenses 
D) convex lenses 
A) converging lenses 
B) diverging lenses 
C) concave lenses 
D) convex lenses

Question 19

The speed of light in a material is  
What is the critical angle of a light ray at the interface between the material and a vacuum?

Accepted Answer

A) 24° 
B) 17° 
C) 19° 
D) 22° 
A) 24° 
B) 17° 
C) 19° 
D) 22°

Question 20

A concave spherical mirror has a focal length of magnitude 20 cm.An object is placed 10 cm in front of the mirror on the mirror's axis.Where is the image located?

Accepted Answer

A) 20 cm behind the mirror 
B) 20 cm in front of the mirror 
C) 6.7 cm behind the mirror 
D) 6.7 cm in front of the mirror 
A) 20 cm behind the mirror 
B) 20 cm in front of the mirror 
C) 6.7 cm behind the mirror 
D) 6.7 cm in front of the mirror

Exam 26: Geometrical Optics

When an object is 12 cm in front of a concave mirror,the image is 3.0 cm in front of the mirror? What is the focal length of the mirror?

A beam of light that is parallel to the principal axis strikes a convex mirror.What happens to the reflected beam of light?

The focal length of a convex mirror is has a magnitude of 20 cm.What is its radius of curvature?

A laser beam strikes a plane mirror's reflecting surface with an angle of incidence of 43°.What is the angle between the incident ray and the reflected ray?

The critical angle for a beam of light passing from water into air is 48.8°.This means that all light rays with an angle of incidence in the water that is greater than 48.8° will be

When an object is 12 cm in front of a concave spherical mirror,the image is formed 3.0 cm in front of the mirror.What is the focal length of the mirror?

A 4.0-cm-tall object is placed 50.0 cm from a diverging lens having a focal length of magnitude 25.0 cm.What is the nature and location of the image?

Light travels from crown glass,with a refractive index of 1.52,into water,having a refractive index of 1.33? The critical angle for this interface is closest to which one of the following angles?

A person jogs toward a plane mirror at a speed of 3 m/s.How fast is he approaching his image in the mirror?

If a object is placed between a convex lens and its focal point,the image formed is

Sometimes when you look into a curved mirror you see a magnified image (a great big you)and sometimes you see a diminished image (a little you).If you look at the bottom (convex)side of a shiny spoon,what will you see?

A beam of light,traveling in air,strikes a plate of transparent material at an angle of incidence of 56.0°.It is observed that the reflected and refracted beams form an angle of 90.0°.What is the index of refraction of this material?

A beam of light traveling in air strikes a slab of transparent material.The incident beam makes an angle of 40° with the normal,and the refracted beam make an angle of 26° with the normal.What is the speed of light in the transparent material? (c = 3.0 × 108 m/s)

Starting from very far away,an object is moved closer and closer to a diverging lens,eventually reaching the lens.What happens to its image formed by that lens? (There could be more than one correct choice. )

An object is 50 cm from a concave mirror with radius of curvature of magnitude 60 cm.What is the lateral magnification produced by the mirror?

A convex mirror has a focal length of magnitude f.An object is placed in front of this mirror at a point F from the face of the mirror.The image will appear

Which of the following terms describe lenses that are thicker at the center than at the edges? (There could be more than one correct choice. )

The speed of light in a material is What is the critical angle of a light ray at the interface between the material and a vacuum?

A concave spherical mirror has a focal length of magnitude 20 cm.An object is placed 10 cm in front of the mirror on the mirror's axis.Where is the image located?

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

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Linear Momentum and Collisions

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The Laws of Thermodynamics

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A beam of light traveling in air strikes a slab of transparent material.The incident beam makes an angle of 40° with the normal,and the refracted beam make an angle of 26° with the normal.What is the speed of light in the transparent material? (c = 3.0 × 10⁸ m/s)