Question 1

Parallel rays of light that hit a concave mirror will come together

Accepted Answer

A) at the center of curvature. 
B) at the focal point. 
C) at a point half way to the focal point. 
D) at infinity. 
A) at the center of curvature. 
B) at the focal point. 
C) at a point half way to the focal point. 
D) at infinity.

Question 2

If an optical system consists only of an object and a single convex mirror,

Accepted Answer

A) the image will sometimes be inverted. 
B) the magnification will sometimes have an absolute value greater than 1. 
C) the image distance will never be negative. 
D) the image will always be virtual. 
A) the image will sometimes be inverted. 
B) the magnification will sometimes have an absolute value greater than 1. 
C) the image distance will never be negative. 
D) the image will always be virtual.

Question 3

A 1.40-cm-tall object is placed along the principal axis of a thin convex lens of 13.0 cm focal length.If the object distance is 19.2 cm,which of the following best describes the image distance and height,respectively?

Accepted Answer

A) 7.75 cm and 4.34 cm 
B) 40.3 cm and 2.94 cm 
C) 7.75 cm and 7.27 cm 
D) 9.16 cm and 4.34 cm 
E) 41.4 cm and 0.668 cm 
A) 7.75 cm and 4.34 cm 
B) 40.3 cm and 2.94 cm 
C) 7.75 cm and 7.27 cm 
D) 9.16 cm and 4.34 cm 
E) 41.4 cm and 0.668 cm

Question 4

An object of length 5.00 cm is inside a plastic block with index of refraction 1.50.If the object is viewed from directly above,what is the length of its image?

Accepted Answer

A) 5.00 cm 
B) 7.50 cm 
C) 3.33 cm 
D) 4.08 cm 
E) ​2.22 cm 
A) 5.00 cm 
B) 7.50 cm 
C) 3.33 cm 
D) 4.08 cm 
E) ​2.22 cm

Question 5

You stand two feet away from a plane mirror.How far is it from you to your image?

Accepted Answer

A) 2 ft 
B) 3 ft 
C) 4 ft 
D) 1 ft 
E) ​8 ft 
A) 2 ft 
B) 3 ft 
C) 4 ft 
D) 1 ft 
E) ​8 ft

Question 6

A fused combination of a diverging and converging lens pair each made from a different index of refraction glass,is used to reduce the occurrence of which of the following effects?

Accepted Answer

A) spherical aberration 
B) mirages 
C) chromatic aberration 
D) light scattering 
A) spherical aberration 
B) mirages 
C) chromatic aberration 
D) light scattering

Question 7

Which of the following effects is the result of the fact that the index of refraction of glass will vary with wavelength?

Accepted Answer

A) spherical aberration 
B) mirages 
C) chromatic aberration 
D) light scattering 
A) spherical aberration 
B) mirages 
C) chromatic aberration 
D) light scattering

Question 8

An object,located 80.0 cm from a concave lens,forms an image 39.6 cm from the lens on the same side as the object.What is the focal length of the lens?

Accepted Answer

A) -26.5 cm 
B) -120 cm 
C) -78.4 cm 
D) -80.8 cm 
E) -20.0 cm 
A) -26.5 cm 
B) -120 cm 
C) -78.4 cm 
D) -80.8 cm 
E) -20.0 cm

Question 9

A candle is 32.0 cm in front of a convex spherical mirror of radius of curvature 68.0 cm.What are the image distance and the magnification,respectively?

Accepted Answer

A) -16.5 cm,+ 0.515 
B) -21.8 cm,- 1.94 
C) -36.0 cm,+ 0.242 
D) -1.9 cm,+ 1.94 
E) 16.5 cm,- 0.515 
A) -16.5 cm,+ 0.515 
B) -21.8 cm,- 1.94 
C) -36.0 cm,+ 0.242 
D) -1.9 cm,+ 1.94 
E) 16.5 cm,- 0.515

Question 10

If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror,the required length of the mirror:

Accepted Answer

A) is equal to the height of the man. 
B) is equal to one half the height of the man. 
C) depends on the distance the man stands from the mirror. 
D) depends on both the height of the man and the distance from the man to the mirror. 
A) is equal to the height of the man. 
B) is equal to one half the height of the man. 
C) depends on the distance the man stands from the mirror. 
D) depends on both the height of the man and the distance from the man to the mirror.

Question 11

A concave mirror forms a real image at 35.2 cm from the mirror surface along the principal axis.If the corresponding object is at a 12.6-cm distance,what is the mirror's focal length?

Accepted Answer

A) 22.6 cm 
B) 47.8 cm 
C) 10.8 cm 
D) 9.28 cm 
E) 19.6 cm 
A) 22.6 cm 
B) 47.8 cm 
C) 10.8 cm 
D) 9.28 cm 
E) 19.6 cm

Question 12

Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror?

Accepted Answer

A) virtual,upright and magnification greater than one 
B) real,inverted and magnification less than one 
C) virtual,upright and magnification less than one 
D) real,inverted and magnification greater than one 
A) virtual,upright and magnification greater than one 
B) real,inverted and magnification less than one 
C) virtual,upright and magnification less than one 
D) real,inverted and magnification greater than one

Question 13

Which of the following statements is true?​

Accepted Answer

A) ​For an object at a concave mirror's center of curvature,the image is real and upright. 
B) ​For an object in front of a convex mirror,the image is always virtual and upright. 
C) ​As an object approaches the focal point of a concave mirror,the image size shrinks to zero. 
D) ​All of the above statements are true. 
A) ​For an object at a concave mirror's center of curvature,the image is real and upright. 
B) ​For an object in front of a convex mirror,the image is always virtual and upright. 
C) ​As an object approaches the focal point of a concave mirror,the image size shrinks to zero. 
D) ​All of the above statements are true.

Question 14

An eyeglass lens is cut with one surface having a radius R1 and the other surface having a radius R2,with R1 2.Both positive radii are measured from the same side with R1 being the side closer to the eye.Is this convex-concave lens a converging lens or a diverging lens?

Accepted Answer

A) This is a converging lens. 
B) This is a diverging lens. 
C) This can be either a converging or diverging lens,as more information is needed for a final determination. 
D) This is neither,since a lens cannot be made this way. 
A) This is a converging lens. 
B) This is a diverging lens. 
C) This can be either a converging or diverging lens,as more information is needed for a final determination. 
D) This is neither,since a lens cannot be made this way.

Question 15

Atmospheric refraction of light rays is responsible for

Accepted Answer

A) spherical aberration. 
B) mirages. 
C) chromatic aberration. 
D) light scattering. 
A) spherical aberration. 
B) mirages. 
C) chromatic aberration. 
D) light scattering.

Question 16

A goldfish is swimming in water (n = 1.33)inside a spherical plastic bowl of index of refraction 1.33.If the goldfish is 10.4 cm from the front wall of the 26.4-cm radius bowl,where does the goldfish appear to an observer in front of the bowl?

Accepted Answer

A) 7.12 cm behind the plastic 
B) 15.9 cm behind the plastic 
C) 12.2 cm behind the plastic 
D) 8.67 cm behind the plastic 
E) 12.2 cm behind the plastic. 
A) 7.12 cm behind the plastic 
B) 15.9 cm behind the plastic 
C) 12.2 cm behind the plastic 
D) 8.67 cm behind the plastic 
E) 12.2 cm behind the plastic.

Question 17

A lens of 15.0-cm focal length is placed 21.0 cm to the right of the object and a mirror of focal length -22.0 cm is placed 59.0 cm to the right of the lens.Where is the image formed by the mirror?

Accepted Answer

A) 3.9 cm to the right of the mirror 
B) 15.5 cm to the left of the mirror 
C) 9.2 cm to the left of the lens 
D) 5.0 cm to the right of the mirror 
E) ​5.0 cm to the left of the mirror 
A) 3.9 cm to the right of the mirror 
B) 15.5 cm to the left of the mirror 
C) 9.2 cm to the left of the lens 
D) 5.0 cm to the right of the mirror 
E) ​5.0 cm to the left of the mirror

Question 18

The magnification for a flat mirror:

Accepted Answer

A) is a function of the image distance. 
B) is a function of the object distance. 
C) is a function of the object and image distances. 
D) is 1. 
A) is a function of the image distance. 
B) is a function of the object distance. 
C) is a function of the object and image distances. 
D) is 1.

Question 19

If a virtual image is formed 14.5 cm along the principal axis from a convex mirror of focal length -19.5 cm,how far is the object from the mirror?

Accepted Answer

A) 56.6 cm 
B) 14.5 cm 
C) 5.00 cm 
D) 20.0 cm 
E) 6.80 cm 
A) 56.6 cm 
B) 14.5 cm 
C) 5.00 cm 
D) 20.0 cm 
E) 6.80 cm

Question 20

For a diverging lens with one flat surface,the radius of curvature for the curved surface is 25.0 cm.What must the index of refraction be so that the focal length is -17.0 cm?

Accepted Answer

A) 0.680 
B) 1.68 
C) 2.47 
D) 1.74 
E) 1.47 
A) 0.680 
B) 1.68 
C) 2.47 
D) 1.74 
E) 1.47

Exam 23: Mirrors and Lenses

Parallel rays of light that hit a concave mirror will come together

If an optical system consists only of an object and a single convex mirror,

A 1.40-cm-tall object is placed along the principal axis of a thin convex lens of 13.0 cm focal length.If the object distance is 19.2 cm,which of the following best describes the image distance and height,respectively?

An object of length 5.00 cm is inside a plastic block with index of refraction 1.50.If the object is viewed from directly above,what is the length of its image?

You stand two feet away from a plane mirror.How far is it from you to your image?

A fused combination of a diverging and converging lens pair each made from a different index of refraction glass,is used to reduce the occurrence of which of the following effects?

Which of the following effects is the result of the fact that the index of refraction of glass will vary with wavelength?

An object,located 80.0 cm from a concave lens,forms an image 39.6 cm from the lens on the same side as the object.What is the focal length of the lens?

A candle is 32.0 cm in front of a convex spherical mirror of radius of curvature 68.0 cm.What are the image distance and the magnification,respectively?

If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror,the required length of the mirror:

A concave mirror forms a real image at 35.2 cm from the mirror surface along the principal axis.If the corresponding object is at a 12.6-cm distance,what is the mirror's focal length?

Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror?

Which of the following statements is true?​

An eyeglass lens is cut with one surface having a radius R1 and the other surface having a radius R2,with R1 < R2.Both positive radii are measured from the same side with R1 being the side closer to the eye.Is this convex-concave lens a converging lens or a diverging lens?

Atmospheric refraction of light rays is responsible for

A goldfish is swimming in water (n = 1.33)inside a spherical plastic bowl of index of refraction 1.33.If the goldfish is 10.4 cm from the front wall of the 26.4-cm radius bowl,where does the goldfish appear to an observer in front of the bowl?

A lens of 15.0-cm focal length is placed 21.0 cm to the right of the object and a mirror of focal length -22.0 cm is placed 59.0 cm to the right of the lens.Where is the image formed by the mirror?

The magnification for a flat mirror:

If a virtual image is formed 14.5 cm along the principal axis from a convex mirror of focal length -19.5 cm,how far is the object from the mirror?

For a diverging lens with one flat surface,the radius of curvature for the curved surface is 25.0 cm.What must the index of refraction be so that the focal length is -17.0 cm?

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Filters

Which of the following statements is true?

An eyeglass lens is cut with one surface having a radius R₁ and the other surface having a radius R₂,with R₁ < R₂.Both positive radii are measured from the same side with R₁ being the side closer to the eye.Is this convex-concave lens a converging lens or a diverging lens?