Question 1

A fish appears to be 2.00 m below the surface of a pond when viewed almost directly above by a fisherman.What is the actual depth of the fish? (nwater = 1.33)

Accepted Answer

A) 2.66 m 
B) 0.67 m 
C) 1.5 m 
D) 0.38 m 
A) 2.66 m 
B) 0.67 m 
C) 1.5 m 
D) 0.38 m A

Question 2

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 are the nature and location of the image? The image is

Accepted Answer

A) real,4.0 cm tall,and 20 cm from the lens on the side opposite the object. 
B) virtual,4.0 cm tall,and 20 cm from the lens on the side opposite the object. 
C) virtual,2.0 cm tall,and 10 cm from the lens on the side opposite the object. 
D) virtual,1.3 cm tall,and 16.7 cm from the lens on the same side of the object. 
E) real,1.3 cm tall,and 16.7 cm from the lens on the same side of the object. 
A) real,4.0 cm tall,and 20 cm from the lens on the side opposite the object. 
B) virtual,4.0 cm tall,and 20 cm from the lens on the side opposite the object. 
C) virtual,2.0 cm tall,and 10 cm from the lens on the side opposite the object. 
D) virtual,1.3 cm tall,and 16.7 cm from the lens on the same side of the object. 
E) real,1.3 cm tall,and 16.7 cm from the lens on the same side of the object. D

Question 3

When light goes from one material into another material having a HIGHER index of refraction,

Accepted Answer

A) its speed,wavelength,and frequency all decrease. 
B) its speed and wavelength decrease,but its frequency stays the same. 
C) its speed decreases but its wavelength and frequency both increase. 
D) its speed decreases but its frequency and wavelength stay the same. 
E) its speed increases,its wavelength decreases,and its frequency stays the same. 
A) its speed,wavelength,and frequency all decrease. 
B) its speed and wavelength decrease,but its frequency stays the same. 
C) its speed decreases but its wavelength and frequency both increase. 
D) its speed decreases but its frequency and wavelength stay the same. 
E) its speed increases,its wavelength decreases,and its frequency stays the same. B

Question 4

An optical fiber made of glass with an index of refraction 1.50 is coated with a plastic with index of refraction 1.30.What is the critical angle of this fiber at the glass-plastic interface?

Accepted Answer

A) 90.0° 
B) 41.8° 
C) 60.1° 
D) 50.2° 
E) 61.1° 
A) 90.0° 
B) 41.8° 
C) 60.1° 
D) 50.2° 
E) 61.1°

Question 5

The spherical side mirror on a car is convex and has a radius of curvature of 25 cm.Another car is following,20 m behind the mirror.If the height of the car is 1.6 m,how tall is its image?

Accepted Answer

A) 5.0 cm 
B) 2.0 cm 
C) 4.0 cm 
D) 3.0 cm 
E) 0.99 cm 
A) 5.0 cm 
B) 2.0 cm 
C) 4.0 cm 
D) 3.0 cm 
E) 0.99 cm

Question 6

In the figure,the image is viewed on a screen and is 13.5 mm tall.What is the focal length of the lens?

Accepted Answer

A) +14.6 cm 
B) -14.6 cm 
C) +20.4 cm 
D) -89.3 cm 
E) +124 cm 
A) +14.6 cm 
B) -14.6 cm 
C) +20.4 cm 
D) -89.3 cm 
E) +124 cm

Question 7

How far are you from your image when you stand 0.750 m in front of a vertical plane mirror?

Accepted Answer

A) 0.375 m 
B) 0.750 m 
C) 1.50 m 
D) 3.00 m 
A) 0.375 m 
B) 0.750 m 
C) 1.50 m 
D) 3.00 m

Question 8

An object is placed in front of a lens which forms an image of the object.

Accepted Answer

A) If the lens is convex,the image cannot be virtual. 
B) If the image is real,then it is also inverted. 
C) If the image is real,then it is also upright. 
D) If the image is virtual,then it is also inverted. 
E) If the image is virtual,the lens must be a diverging lens. 
A) If the lens is convex,the image cannot be virtual. 
B) If the image is real,then it is also inverted. 
C) If the image is real,then it is also upright. 
D) If the image is virtual,then it is also inverted. 
E) If the image is virtual,the lens must be a diverging lens.

Question 9

An object is 12 cm in front of a concave spherical mirror,and 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

Question 10

When an object 1.15 cm tall is placed 12 cm from a lens,the lens produces an upright image of the object that is 5.75 cm tall.What is the focal length of the lens?

Accepted Answer

A) 24 cm 
B) 18 cm 
C) 60 cm 
D) 15 cm 
E) 9.0 cm 
A) 24 cm 
B) 18 cm 
C) 60 cm 
D) 15 cm 
E) 9.0 cm

Question 11

An object is placed 100 cm in front of a lens of focal length 20 cm.A second lens is placed 35 cm beyond the first,this second lens having a focal length of 8.0 cm.If the height of the object is 6.0 cm,what is the height of the final image?

Accepted Answer

A) 1.5 cm 
B) 12 cm 
C) 9.0 cm 
D) 3.0 cm 
E) 6.0 cm 
A) 1.5 cm 
B) 12 cm 
C) 9.0 cm 
D) 3.0 cm 
E) 6.0 cm

Question 12

An object 4.0 cm in height is placed 8.0 cm in front of a concave spherical mirror with a focal length of 10.0 cm.What is the position of its image in relation to the mirror,and what are the characteristics of the image?

Accepted Answer

A) 40.0 cm on the other side of mirror,real,6.0 times bigger 
B) 10.0 cm on the other side of mirror,virtual,10.0 times bigger 
C) 18.0 cm on the same side of mirror,virtual,2.25 times bigger 
D) 10.0 cm on the same side of mirror,real,6.0 times bigger 
E) 40.0 cm on the other side of mirror,virtual,5.0 times bigger 
A) 40.0 cm on the other side of mirror,real,6.0 times bigger 
B) 10.0 cm on the other side of mirror,virtual,10.0 times bigger 
C) 18.0 cm on the same side of mirror,virtual,2.25 times bigger 
D) 10.0 cm on the same side of mirror,real,6.0 times bigger 
E) 40.0 cm on the other side of mirror,virtual,5.0 times bigger

Question 13

A double-concave lens has equal radii of curvature of   An object placed   from the lens forms a virtual image   from the lens.What is the index of refraction of the lens material?

Accepted Answer

A) 1.90 
B) 1.98 
C) 1.82 
D) 1.77 
A) 1.90 
B) 1.98 
C) 1.82 
D) 1.77

Question 14

A thin double convex lens is to focus the image of an object onto a screen so that the image is life-sized.The lens surfaces have equal radii of curvature of 112 cm,and the refractive index of the lens material is 1.500.
(a)How far from the lens should the screen be placed?
(b)How far is the screen from the object?

Accepted Answer

The answer of A thin double convex lens is to...

Question 15

A thin converging lens is found to form an image of a distant building 24 cm from the lens.If an insect is now placed 16 cm from this lens,how far FROM THE INSECT will its image be formed?

Accepted Answer

A) 64 cm 
B) 72 cm 
C) 32 cm 
D) 96 cm 
E) 48 cm 
A) 64 cm 
B) 72 cm 
C) 32 cm 
D) 96 cm 
E) 48 cm

Question 16

A fisherman in a stream 39 cm deep looks downward into the water and sees a rock on the stream bed.How deep does the stream appear to the fisherman? The index of refraction of the water is 1.33.

Accepted Answer

A) 29 cm 
B) 52 cm 
C) 33 cm 
D) 45 cm 
A) 29 cm 
B) 52 cm 
C) 33 cm 
D) 45 cm

Question 17

An object is placed 100 cm in front of a diverging lens with a focal length of magnitude 25 cm.A converging lens having a focal length of magnitude 33.33 cm is placed 30 cm past the first lens.Where is the final image formed?

Accepted Answer

A) 30 cm after the second lens 
B) 20 cm in front of the first lens 
C) 3.0 meters before the second lens 
D) 100 cm after the second lens 
E) 3.0 cm before the second lens 
A) 30 cm after the second lens 
B) 20 cm in front of the first lens 
C) 3.0 meters before the second lens 
D) 100 cm after the second lens 
E) 3.0 cm before the second lens

Question 18

A convex-concave thin lens is made with the radius of curvature of the convex surface being 25.0 cm and the concave surface 45.0 cm.If the glass used has index of refraction 1.500,what is the focal length of this lens?

Accepted Answer

A) -32.0 cm 
B) 32.0 cm 
C) 113 cm 
D) 67.5 cm 
E) -113 cm 
A) -32.0 cm 
B) 32.0 cm 
C) 113 cm 
D) 67.5 cm 
E) -113 cm

Question 19

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

Accepted Answer

A) 0.50 
B) 1.0 
C) 1.5 
D) 2.0 
E) 2.5 
A) 0.50 
B) 1.0 
C) 1.5 
D) 2.0 
E) 2.5

Question 20

Light strikes a 5.0-cm thick sheet of glass at an angle of incidence in air of 50°.The sheet has parallel faces and the glass has an index of refraction 1.50.
(a)What is the angle of refraction in the glass?
(b)After traveling through the glass the light re-emerges into the air.What is the final angle of refraction in air?
(c)As it leaves the glass,by what distance is the path of the ray is displaced from what it was before entering the glass?

Accepted Answer

(a)31° (b)

Exam 34: Ray Optics

A fish appears to be 2.00 m below the surface of a pond when viewed almost directly above by a fisherman.What is the actual depth of the fish? (nwater = 1.33)

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 are the nature and location of the image? The image is

When light goes from one material into another material having a HIGHER index of refraction,

An optical fiber made of glass with an index of refraction 1.50 is coated with a plastic with index of refraction 1.30.What is the critical angle of this fiber at the glass-plastic interface?

The spherical side mirror on a car is convex and has a radius of curvature of 25 cm.Another car is following,20 m behind the mirror.If the height of the car is 1.6 m,how tall is its image?

In the figure,the image is viewed on a screen and is 13.5 mm tall.What is the focal length of the lens?

How far are you from your image when you stand 0.750 m in front of a vertical plane mirror?

An object is placed in front of a lens which forms an image of the object.

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

When an object 1.15 cm tall is placed 12 cm from a lens,the lens produces an upright image of the object that is 5.75 cm tall.What is the focal length of the lens?

An object is placed 100 cm in front of a lens of focal length 20 cm.A second lens is placed 35 cm beyond the first,this second lens having a focal length of 8.0 cm.If the height of the object is 6.0 cm,what is the height of the final image?

An object 4.0 cm in height is placed 8.0 cm in front of a concave spherical mirror with a focal length of 10.0 cm.What is the position of its image in relation to the mirror,and what are the characteristics of the image?

A double-concave lens has equal radii of curvature of An object placed from the lens forms a virtual image from the lens.What is the index of refraction of the lens material?

A thin converging lens is found to form an image of a distant building 24 cm from the lens.If an insect is now placed 16 cm from this lens,how far FROM THE INSECT will its image be formed?

A fisherman in a stream 39 cm deep looks downward into the water and sees a rock on the stream bed.How deep does the stream appear to the fisherman? The index of refraction of the water is 1.33.

An object is placed 100 cm in front of a diverging lens with a focal length of magnitude 25 cm.A converging lens having a focal length of magnitude 33.33 cm is placed 30 cm past the first lens.Where is the final image formed?

A convex-concave thin lens is made with the radius of curvature of the convex surface being 25.0 cm and the concave surface 45.0 cm.If the glass used has index of refraction 1.500,what is the focal length of this lens?

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

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A fish appears to be 2.00 m below the surface of a pond when viewed almost directly above by a fisherman.What is the actual depth of the fish? (n_water = 1.33)