Question 1

An object is placed 10 cm from a convex lens with a focal length of magnitude 20 cm.What is the magnification?

Accepted Answer

A) 0.50 
B) -2.0 
C) 1.5 
D) 2.0 
E) -2.5 
A) 0.50 
B) -2.0 
C) 1.5 
D) 2.0 
E) -2.5

Question 2

If you stand in front of a convex mirror,at the same distance from it as its radius of curvature,

Accepted Answer

A) you won't see your image because there is none. 
B) you won't see your image because it is focused at infinity. 
C) you will see your image and you will appear smaller than you. 
D) you will see your image and you will appear larger than you. 
E) you will see your image and it will be the same size as you except upside down. 
A) you won't see your image because there is none. 
B) you won't see your image because it is focused at infinity. 
C) you will see your image and you will appear smaller than you. 
D) you will see your image and you will appear larger than you. 
E) you will see your image and it will be the same size as you except upside down.

Question 3

A light beam is traveling inside a glass block that has an index of refraction of 1.46.As this light arrives at the surface of the block,it makes an angle of 53.0° with the normal.At what angle with the normal in the air will it leave the block?

Accepted Answer

A) It will not leave. 
B) 59.1° 
C) 43.2° 
D) 33.2° 
A) It will not leave. 
B) 59.1° 
C) 43.2° 
D) 33.2°

Question 4

Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice. )

Accepted Answer

A) The image is always real. 
B) The image is always virtual. 
C) The image is always inverted. 
D) The image is always upright. 
E) None of the above choices are correct. 
A) The image is always real. 
B) The image is always virtual. 
C) The image is always inverted. 
D) The image is always upright. 
E) None of the above choices are correct.

Question 5

If the index of refraction of a material is 2,this means that light travels

Accepted Answer

A) 2 times as fast in air as it does in vacuum. 
B) 2 times as fast in the material as it does in air. 
C) 2 times as fast in vacuum as it does in the material. 
D) 2 times as fast in the material than it does in vacuum. 
E) 1/2 as fast in air as it does in the material. 
A) 2 times as fast in air as it does in vacuum. 
B) 2 times as fast in the material as it does in air. 
C) 2 times as fast in vacuum as it does in the material. 
D) 2 times as fast in the material than it does in vacuum. 
E) 1/2 as fast in air as it does in the material.

Question 6

A statue that is 10.4 cm tall is placed 4.8 cm in front of a concave lens.The image is 4.0 cm from the lens.How tall is the image?

Accepted Answer

A) 13 cm 
B) 8.7 cm 
C) 5.4 cm 
D) 1.8 cm 
A) 13 cm 
B) 8.7 cm 
C) 5.4 cm 
D) 1.8 cm

Question 7

An object that is 10.0 cm tall is placed 37.0 cm in front of a concave mirror of focal length 18.5 cm.How tall is the image?

Accepted Answer

A) 2.5 cm 
B) 5.0 cm 
C) 7.5 cm 
D) 20.0 cm 
E) 10.0 cm 
A) 2.5 cm 
B) 5.0 cm 
C) 7.5 cm 
D) 20.0 cm 
E) 10.0 cm

Question 8

The index of refraction of a type of glass is 1.50,and the index of refraction of water is 1.33.If light enters water from this glass,the angle of refraction will be

Accepted Answer

A) greater than the angle of incidence. 
B) equal to the angle of incidence. 
C) less than the angle of incidence. 
A) greater than the angle of incidence. 
B) equal to the angle of incidence. 
C) less than the angle of incidence.

Question 9

An object that is 4.00 cm tall is placed 18.0 cm in front of a concave mirror having a focal length of 20.0 cm.What is the location of its image in relation to the mirror and what are its characteristics?

Accepted Answer

A) 180 cm on the other side of mirror,real,6.00 times bigger 
B) 10 cm on the other side of mirror,virtual,10.0 times bigger 
C) 18 cm on the same side of mirror,virtual,2.25 times bigger 
D) 20 cm on the same side of mirror,real,10.0 times bigger 
E) 180 cm on the other side of mirror,virtual,10.0 times bigger 
A) 180 cm on the other side of mirror,real,6.00 times bigger 
B) 10 cm on the other side of mirror,virtual,10.0 times bigger 
C) 18 cm on the same side of mirror,virtual,2.25 times bigger 
D) 20 cm on the same side of mirror,real,10.0 times bigger 
E) 180 cm on the other side of mirror,virtual,10.0 times bigger

Question 10

A 4.0-cm tall object is placed 60 cm in front of a converging lens of focal length of magnitude 30 cm.What are the nature and location of the image?

Accepted Answer

A) The image is real,2.5 cm tall,30 cm on the same side as object. 
B) The image is virtual,2.5 cm tall,30 cm on the other side of the lens. 
C) The image is virtual,2.0 cm tall,15 cm on the other side of the lens. 
D) The image is virtual,4.0 cm tall,60 cm on the same side as object. 
E) The image is real,4.0 cm tall,60 cm on the other side of the lens. 
A) The image is real,2.5 cm tall,30 cm on the same side as object. 
B) The image is virtual,2.5 cm tall,30 cm on the other side of the lens. 
C) The image is virtual,2.0 cm tall,15 cm on the other side of the lens. 
D) The image is virtual,4.0 cm tall,60 cm on the same side as object. 
E) The image is real,4.0 cm tall,60 cm on the other side of the lens.

Question 11

The speed of light in a certain material is measured to be 2.2 × 108 m/s.What is the index of refraction of this material? (c = 3.0 × 108 m/s)

Accepted Answer

A) 1.1 
B) 1.2 
C) 1.4 
D) 1.6 
E) 1.8 
A) 1.1 
B) 1.2 
C) 1.4 
D) 1.6 
E) 1.8

Question 12

A beam of light in air enters a glass slab with an index of refraction of 1.40 at an angle of incidence of 30.0°.What is the angle of refraction?

Accepted Answer

A) 20.9° 
B) 47.5° 
C) 51.8° 
D) 30.0° 
E) 14.9° 
A) 20.9° 
B) 47.5° 
C) 51.8° 
D) 30.0° 
E) 14.9°

Question 13

An object is placed to the left of a spherical mirror in front of the mirror.If the image of the object is formed on the right side of the mirror,which of the following statements must be true? (There could be more than one correct choice. )

Accepted Answer

A) The image is upright and the mirror must be convex. 
B) The image is inverted and real,and the mirror must be convex. 
C) The image is upright and the mirror must be concave. 
D) The image is upright and virtual. 
E) The mirror could be either concave or convex. 
A) The image is upright and the mirror must be convex. 
B) The image is inverted and real,and the mirror must be convex. 
C) The image is upright and the mirror must be concave. 
D) The image is upright and virtual. 
E) The mirror could be either concave or convex.

Question 14

A convex lens has focal length f.If an object is placed at a distance between f and 2f from the lens on the principal axis,the image is located at a distance from the lens

Accepted Answer

A) of 2f. 
B) between f and 2f. 
C) of f. 
D) that is greater than 2f. 
E) of infinity. 
A) of 2f. 
B) between f and 2f. 
C) of f. 
D) that is greater than 2f. 
E) of infinity.

Question 15

A scuba diver is 1.2 m beneath the surface of a still pond of water.At what angle relative to the normal at the surface must the diver shine a beam of light toward the surface in order for a person on a distant bank to be able to see it? The index of refraction for water is 1.33.

Accepted Answer

A) 41° 
B) 48° 
C) 59° 
D) 90° 
E) 0° 
A) 41° 
B) 48° 
C) 59° 
D) 90° 
E) 0°

Question 16

Single convex spherical mirrors produce images that

Accepted Answer

A) are always smaller than the actual object. 
B) are always larger than the actual object. 
C) are always the same size as the actual object. 
D) could be larger than,smaller than,or the same size as the actual object,depending on the placement of the object. 
E) are sometimes real. 
A) are always smaller than the actual object. 
B) are always larger than the actual object. 
C) are always the same size as the actual object. 
D) could be larger than,smaller than,or the same size as the actual object,depending on the placement of the object. 
E) are sometimes real.

Question 17

An object that is 2.0 cm tall is placed at the center of curvature in front of a concave mirror.How tall is its image?

Accepted Answer

A) 0.50 cm 
B) 1.0 cm 
C) 1.5 cm 
D) 2.0 cm 
E) infinite 
A) 0.50 cm 
B) 1.0 cm 
C) 1.5 cm 
D) 2.0 cm 
E) infinite

Question 18

When a person stands 40 cm in front of a cosmetic (concave)spherical mirror,the upright image is twice the size of the object.What is the focal length of the mirror?

Accepted Answer

A) 27 cm 
B) 40 cm 
C) 80 cm 
D) 160 cm 
A) 27 cm 
B) 40 cm 
C) 80 cm 
D) 160 cm

Question 19

An object that is 47.5 cm tall forms an image that is 38.6 cm tall and 14.8 cm from a spherical mirror.How far is the object from the mirror?

Accepted Answer

A) 124 cm 
B) 47.6 cm 
C) 18.2 cm 
D) 12.0 cm 
A) 124 cm 
B) 47.6 cm 
C) 18.2 cm 
D) 12.0 cm

Question 20

Is it possible to see a virtual image?

Accepted Answer

A) No,since the rays that seem to emanate from a virtual image do not in fact emanate from the image. 
B) No,since virtual images do not really exist. 
C) Yes because the rays that appear to come from a virtual image can be focused by the eye just like those from an object. 
D) Yes,but only by using an additional lens to form a real image before the light reaches the eye. 
A) No,since the rays that seem to emanate from a virtual image do not in fact emanate from the image. 
B) No,since virtual images do not really exist. 
C) Yes because the rays that appear to come from a virtual image can be focused by the eye just like those from an object. 
D) Yes,but only by using an additional lens to form a real image before the light reaches the eye.

Exam 26: Geometrical Optics

An object is placed 10 cm from a convex lens with a focal length of magnitude 20 cm.What is the magnification?

If you stand in front of a convex mirror,at the same distance from it as its radius of curvature,

A light beam is traveling inside a glass block that has an index of refraction of 1.46.As this light arrives at the surface of the block,it makes an angle of 53.0° with the normal.At what angle with the normal in the air will it leave the block?

Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice. )

If the index of refraction of a material is 2,this means that light travels

A statue that is 10.4 cm tall is placed 4.8 cm in front of a concave lens.The image is 4.0 cm from the lens.How tall is the image?

An object that is 10.0 cm tall is placed 37.0 cm in front of a concave mirror of focal length 18.5 cm.How tall is the image?

The index of refraction of a type of glass is 1.50,and the index of refraction of water is 1.33.If light enters water from this glass,the angle of refraction will be

An object that is 4.00 cm tall is placed 18.0 cm in front of a concave mirror having a focal length of 20.0 cm.What is the location of its image in relation to the mirror and what are its characteristics?

A 4.0-cm tall object is placed 60 cm in front of a converging lens of focal length of magnitude 30 cm.What are the nature and location of the image?

The speed of light in a certain material is measured to be 2.2 × 108 m/s.What is the index of refraction of this material? (c = 3.0 × 108 m/s)

A beam of light in air enters a glass slab with an index of refraction of 1.40 at an angle of incidence of 30.0°.What is the angle of refraction?

An object is placed to the left of a spherical mirror in front of the mirror.If the image of the object is formed on the right side of the mirror,which of the following statements must be true? (There could be more than one correct choice. )

A convex lens has focal length f.If an object is placed at a distance between f and 2f from the lens on the principal axis,the image is located at a distance from the lens

A scuba diver is 1.2 m beneath the surface of a still pond of water.At what angle relative to the normal at the surface must the diver shine a beam of light toward the surface in order for a person on a distant bank to be able to see it? The index of refraction for water is 1.33.

Single convex spherical mirrors produce images that

An object that is 2.0 cm tall is placed at the center of curvature in front of a concave mirror.How tall is its image?

When a person stands 40 cm in front of a cosmetic (concave)spherical mirror,the upright image is twice the size of the object.What is the focal length of the mirror?

An object that is 47.5 cm tall forms an image that is 38.6 cm tall and 14.8 cm from a spherical mirror.How far is the object from the mirror?

Is it possible to see a virtual image?

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

Applications of Newtons Laws

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Potential Energy and Conservation of Energy

Linear Momentum and Collisions

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The Laws of Thermodynamics

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Magnetic Flux and Faradays Law of Induction

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The speed of light in a certain material is measured to be 2.2 × 10⁸ m/s.What is the index of refraction of this material? (c = 3.0 × 10⁸ m/s)