Question 1

A short sighted person's range of vision is between 12 cm and 35 cm from the eye.What focal length lens is needed to allow her to see distant objects clearly?

Accepted Answer

A) 35 cm 
B) -12 cm 
C) -23 cm 
D) 12 cm 
E) -35 cm 
A) 35 cm 
B) -12 cm 
C) -23 cm 
D) 12 cm 
E) -35 cm E

Question 2

An elderly person's range of vision is between 70 cm and 300 cm from the eye.What focal length lens is needed to allow her to read a newspaper clearly at the normal distance of 25 cm from her eyes?

Accepted Answer

A) 38.9 cm 
B) 18.4 cm 
C) 27.3cm 
D) 23.1 cm 
E) 70.0 cm 
A) 38.9 cm 
B) 18.4 cm 
C) 27.3cm 
D) 23.1 cm 
E) 70.0 cm A

Question 3

An object is placed to the left of a thin converging lens with a focal length of 8 cm.A real and inverted image is formed 13.3 cm to the right of the lens.What is the distance of the object from the lens?

Accepted Answer

A) 20.1 cm 
B) 13.3 cm 
C) 5.00 cm 
D) 0.20 cm 
E) 21.3 cm 
A) 20.1 cm 
B) 13.3 cm 
C) 5.00 cm 
D) 0.20 cm 
E) 21.3 cm A

Question 4

A positive lens has a focal length f.The image is the same size as the object when

Accepted Answer

A) the object is at the focal point. 
B) the image is on the opposite side of the lens from the object and is the same distance from the lens as the object. 
C) the image is on the same side of the lens as the object and is the same distance from the lens as the object. 
D) The image can never be the same size as the object. 
E) None of these is correct. 
A) the object is at the focal point. 
B) the image is on the opposite side of the lens from the object and is the same distance from the lens as the object. 
C) the image is on the same side of the lens as the object and is the same distance from the lens as the object. 
D) The image can never be the same size as the object. 
E) None of these is correct.

Question 5

The technical name for the type of image formed by a single plane mirror is

Accepted Answer

A) a real image. 
B) an inverted image. 
C) an enlarged image. 
D) a focal image. 
E) a virtual image. 
A) a real image. 
B) an inverted image. 
C) an enlarged image. 
D) a focal image. 
E) a virtual image.

Question 6

A stamp collector with a normal near point (25 cm)needs a magnifying power of 10 to examine her stamps.What power of magnifying glass should she buy?

Accepted Answer

A) 0.40 diopters 
B) 2.5 diopters 
C) 10 diopters 
D) 40 diopters 
E) 25 diopters 
A) 0.40 diopters 
B) 2.5 diopters 
C) 10 diopters 
D) 40 diopters 
E) 25 diopters

Question 7

The optical path for visible light in a lens is

Accepted Answer

A) the same as the geometrical path. 
B) the same no matter what portion of the lens it passes through. 
C) the same as the optical path for ultraviolet. 
D) independent of the material of which the lens is constructed. 
E) is increased when the index of refraction is increased. 
A) the same as the geometrical path. 
B) the same no matter what portion of the lens it passes through. 
C) the same as the optical path for ultraviolet. 
D) independent of the material of which the lens is constructed. 
E) is increased when the index of refraction is increased.

Question 8

An object is placed 10 inches in front of a concave mirror that has a radius of curvature of 8 inches.The image is located

Accepted Answer

A) 4.75 inches in front of the mirror. 
B) 4.75 inches behind the mirror. 
C) 3 inches behind the mirror. 
D) 6.67 inches behind the mirror. 
E) 6.67 inches in front of the mirror. 
A) 4.75 inches in front of the mirror. 
B) 4.75 inches behind the mirror. 
C) 3 inches behind the mirror. 
D) 6.67 inches behind the mirror. 
E) 6.67 inches in front of the mirror.

Question 9

A microscope has an objective lens of focal length 1.5 cm and an eyepiece of focal length 2.5 cm.Find the physical separation between the two lenses if the magnifying power is 200,assuming the near point of the viewer is 25 cm.

Accepted Answer

A) 30 cm 
B) 21 cm 
C) 34 cm 
D) 26 cm 
E) 29 cm 
A) 30 cm 
B) 21 cm 
C) 34 cm 
D) 26 cm 
E) 29 cm

Question 10

A person uses two microscopes to view the same object.Microscope A is twice as long as microscope B and contains lenses with focal lengths that are one-half those of B.If microscope A provides a magnification of m,then what magnification does B provide?

Accepted Answer

A) m 
B) 2m 
C) m/2 
D) 8m 
E) m/8 
A) m 
B) 2m 
C) m/2 
D) 8m 
E) m/8

Question 11

Your myopic eye cannot focus on objects that are more than 16.5 cm away or closer than 4.5 cm.When you put on glasses for normal distant vision,your new near point is

Accepted Answer

A) 3.5 cm 
B) 16.5 cm 
C) 6.2 cm 
D) 10.5 cm 
E) None of these is correct. 
A) 3.5 cm 
B) 16.5 cm 
C) 6.2 cm 
D) 10.5 cm 
E) None of these is correct.

Question 12

A real object is 30 cm from a negative lens that has a focal length f = -20 cm.The image is

Accepted Answer

A) virtual and 30 cm from the lens. 
B) real and 12 cm from the lens. 
C) virtual and 12 cm from the lens. 
D) real and 20 cm from the lens. 
E) None of these is correct. 
A) virtual and 30 cm from the lens. 
B) real and 12 cm from the lens. 
C) virtual and 12 cm from the lens. 
D) real and 20 cm from the lens. 
E) None of these is correct.

Question 13

The image of an object located 10 cm from a concave spherical mirror of radius 10 cm is

Accepted Answer

A) real,inverted,and magnified. 
B) real,inverted,and diminished. 
C) real,inverted,and the same size. 
D) virtual,erect,and magnified. 
E) virtual,erect,and diminished. 
A) real,inverted,and magnified. 
B) real,inverted,and diminished. 
C) real,inverted,and the same size. 
D) virtual,erect,and magnified. 
E) virtual,erect,and diminished.

Question 14

A concave-convex lens of flint glass has radii of 12 cm and 10 cm,respectively,and an index of refraction of 1.60.The focal length of this lens is

Accepted Answer

A) 100 cm 
B) -100 cm 
C) 9.1 cm 
D) -9.1 cm 
E) 14.5 cm 
A) 100 cm 
B) -100 cm 
C) 9.1 cm 
D) -9.1 cm 
E) 14.5 cm

Question 15

A two lens magnifying system uses lenses of focal lengths 2.5 and 9.5 cm for the objective and eyepiece respectively.The two lenses are positioned 23 cm apart.An object for study is placed 3.0 cm in front of the objective lens.Find the magnification of the final image.

Accepted Answer

A) 15 
B) 6.3 
C) 22 
D) 32 
E) 47 
A) 15 
B) 6.3 
C) 22 
D) 32 
E) 47

Question 16

A circular coin is 33.3 cm from a concave spherical mirror.(Assume the coin is on the optical axis.)The image of the coin is produced 10.0 cm from the mirror and on the same side as its real position.If the coin is moved to a position 23.3 cm from the mirror,calculate how far from the mirror the new image is:

Accepted Answer

A) 13.7 cm 
B) 10.0 cm 
C) 15.1 cm 
D) 8.35 cm 
E) 11.5 cm 
A) 13.7 cm 
B) 10.0 cm 
C) 15.1 cm 
D) 8.35 cm 
E) 11.5 cm

Question 17

A 6-cm-high candle is placed in front of a converging lens with a focal length of magnitude 30 cm.If the image distance is +50 cm,then find the image height of the candle and whether it is upright or inverted.

Accepted Answer

A) 4.0 cm upright 
B) 3.3 cm upright 
C) 3.3 cm inverted 
D) 4.0 cm inverted 
E) None of these is correct. 
A) 4.0 cm upright 
B) 3.3 cm upright 
C) 3.3 cm inverted 
D) 4.0 cm inverted 
E) None of these is correct.

Question 18

If the near point of your eye is 80.0 cm,what power of reading glasses should you use to bring your near point to 25.0 cm?

Accepted Answer

A) -1.25 
B) 4.00 
C) 36.5 
D) 1.25 
E) 27.5 
A) -1.25 
B) 4.00 
C) 36.5 
D) 1.25 
E) 27.5

Question 19

An object 5.0 cm tall is placed 15 cm in front of a converging lens of focal length 30 cm.The final image size is

Accepted Answer

A) 2.5 cm 
B) 3.3 cm 
C) 5.0 cm 
D) 7.5 cm 
E) 10 cm 
A) 2.5 cm 
B) 3.3 cm 
C) 5.0 cm 
D) 7.5 cm 
E) 10 cm

Question 20

A circular coin is 33.3 cm from a concave spherical mirror.(Assume the coin is on the optical axis.)The image of the coin is produced 23.3 cm towards the mirror from its real position.Calculate the focal length of the mirror.

Accepted Answer

A) 15.4 cm 
B) 7.69 cm 
C) 13.7 cm 
D) 27.4 cm 
E) 10.0 cm 
A) 15.4 cm 
B) 7.69 cm 
C) 13.7 cm 
D) 27.4 cm 
E) 10.0 cm

Exam 32: Optical Images

A short sighted person's range of vision is between 12 cm and 35 cm from the eye.What focal length lens is needed to allow her to see distant objects clearly?

An elderly person's range of vision is between 70 cm and 300 cm from the eye.What focal length lens is needed to allow her to read a newspaper clearly at the normal distance of 25 cm from her eyes?

An object is placed to the left of a thin converging lens with a focal length of 8 cm.A real and inverted image is formed 13.3 cm to the right of the lens.What is the distance of the object from the lens?

A positive lens has a focal length f.The image is the same size as the object when

The technical name for the type of image formed by a single plane mirror is

A stamp collector with a normal near point (25 cm)needs a magnifying power of 10 to examine her stamps.What power of magnifying glass should she buy?

The optical path for visible light in a lens is

An object is placed 10 inches in front of a concave mirror that has a radius of curvature of 8 inches.The image is located

A microscope has an objective lens of focal length 1.5 cm and an eyepiece of focal length 2.5 cm.Find the physical separation between the two lenses if the magnifying power is 200,assuming the near point of the viewer is 25 cm.

A person uses two microscopes to view the same object.Microscope A is twice as long as microscope B and contains lenses with focal lengths that are one-half those of B.If microscope A provides a magnification of m,then what magnification does B provide?

Your myopic eye cannot focus on objects that are more than 16.5 cm away or closer than 4.5 cm.When you put on glasses for normal distant vision,your new near point is

A real object is 30 cm from a negative lens that has a focal length f = -20 cm.The image is

The image of an object located 10 cm from a concave spherical mirror of radius 10 cm is

A concave-convex lens of flint glass has radii of 12 cm and 10 cm,respectively,and an index of refraction of 1.60.The focal length of this lens is

A two lens magnifying system uses lenses of focal lengths 2.5 and 9.5 cm for the objective and eyepiece respectively.The two lenses are positioned 23 cm apart.An object for study is placed 3.0 cm in front of the objective lens.Find the magnification of the final image.

A 6-cm-high candle is placed in front of a converging lens with a focal length of magnitude 30 cm.If the image distance is +50 cm,then find the image height of the candle and whether it is upright or inverted.

If the near point of your eye is 80.0 cm,what power of reading glasses should you use to bring your near point to 25.0 cm?

An object 5.0 cm tall is placed 15 cm in front of a converging lens of focal length 30 cm.The final image size is

A circular coin is 33.3 cm from a concave spherical mirror.(Assume the coin is on the optical axis.)The image of the coin is produced 23.3 cm towards the mirror from its real position.Calculate the focal length of the mirror.

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