Question 1

What power contact lens is needed to correct for farsightedness where the uncorrected near point is 75 cm?

Accepted Answer

A) +2.7 D 
B) -2.7 D 
C) +5.3 D 
D) -5.3 D 
A) +2.7 D 
B) -2.7 D 
C) +5.3 D 
D) -5.3 D

Question 2

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 3

An object is placed on the left side of a thin lens,and the image of this object is formed on the left side of the lens.Which of the following statements must be true? (There could be more than one correct choice.)

Accepted Answer

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

Question 4

A 35-mm digital camera using a standard 50.0 mm lens is focused on a 1.80 m tall person who is standing 3.25 m from the lens.You now refocus the camera on a 15.0 cm tall flower that is 75.0 cm from the lens.
(a)In refocusing,by how much did you move the lens? Did you move it toward the film or away from it?
(b)What is the height of the flower's image on the CCD sensor?

Accepted Answer

(a)2.79 mm

Question 5

A coin is 12 cm in front of a convex lens with focal length of magnitude 4.0 cm.Where is the image?

Accepted Answer

A) 8.0 cm behind the lens 
B) 6.0 cm in front of the lens 
C) 6.0 cm behind the lens 
D) 4.0 cm in front of the lens 
A) 8.0 cm behind the lens 
B) 6.0 cm in front of the lens 
C) 6.0 cm behind the lens 
D) 4.0 cm in front of the lens

Question 6

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 7

Mahmood is farsighted and cannot see objects clearly that are closer to his eye than 80.0 cm.What is the focal length of the contact lenses that will enable him to comfortably see objects at a distance of 25.0 cm from his eyes?

Accepted Answer

A) +36.4 cm 
B) -36.4 cm 
C) -21.2 cm 
D) +21.2 cm 
E) +32.5 cm 
A) +36.4 cm 
B) -36.4 cm 
C) -21.2 cm 
D) +21.2 cm 
E) +32.5 cm

Question 8

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

Question 9

What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is at 60 cm?

Accepted Answer

A) -60 cm 
B) -30 cm 
C) +30 cm 
D) +60 cm 
E) +130 cm 
A) -60 cm 
B) -30 cm 
C) +30 cm 
D) +60 cm 
E) +130 cm

Question 10

In a compound microscope

Accepted Answer

A) both the objective and the eyepiece form real images. 
B) magnification is provided by the objective lens and not by the eyepiece. The eyepiece merely increases the resolution of the image viewed. 
C) magnification is provided by the objective and not by the eyepiece. The eyepiece merely increases the brightness of the image viewed. 
D) the magnification is m1 + M2, where m1 is the lateral magnification of the objective and M2 is the angular magnification of the eyepiece. 
E) the image of the objective serves as the object for the eyepiece. 
A) both the objective and the eyepiece form real images. 
B) magnification is provided by the objective lens and not by the eyepiece. The eyepiece merely increases the resolution of the image viewed. 
C) magnification is provided by the objective and not by the eyepiece. The eyepiece merely increases the brightness of the image viewed. 
D) the magnification is m1 + M2, where m1 is the lateral magnification of the objective and M2 is the angular magnification of the eyepiece. 
E) the image of the objective serves as the object for the eyepiece.

Question 11

A slide projector needs to focus the image of a 24.0-mm × 36.0-mm slide onto a square screen 1.50 m on each side.You want to fill the screen as completely as possible without any of the image falling beyond the screen.Due to space constraints in the projector,the slide must be placed 10.5 cm from the lens.
(a)What magnification does the projector produce?
(b)How far from the lens should the screen be placed?
(c)What focal length projector lens is needed?

Accepted Answer

(a)41.7,
(

Question 12

A student wishing to build a telescope has available an eyepiece of focal length -5.0 cm.What focal length objective is needed to obtain a magnification of 10?

Accepted Answer

The answer of A student wishing to build a telescope...

Question 13

The focal lengths of the objective lens and the eyepiece in a microscope are 2.90 mm and 2.50 cm,respectively.An object is placed 3.00 mm from the objective.The image of this object is viewed with the eyepiece adjusted for minimum eyestrain for persons with a near point of 25 cm.What is the distance between the objective and the eyepiece?

Accepted Answer

A) 9.9 cm 
B) 9.0 cm 
C) 15 cm 
D) 11 cm 
E) 13 cm 
A) 9.9 cm 
B) 9.0 cm 
C) 15 cm 
D) 11 cm 
E) 13 cm

Question 14

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 15

Suppose you place an object in front of a concave mirror.Which of the following statements must be true? (There could be more than one correct choice.)

Accepted Answer

A) The image of the object will always be smaller than the object. 
B) No matter where you place the object, a real image of the object will be formed. 
C) The image of the object will always be inverted. 
D) If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual. 
E) No matter where you place the object, the image of the object will always be virtual and upright. 
A) The image of the object will always be smaller than the object. 
B) No matter where you place the object, a real image of the object will be formed. 
C) The image of the object will always be inverted. 
D) If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual. 
E) No matter where you place the object, the image of the object will always be virtual and upright.

Question 16

What is the power of a lens that has a focal length of -40 cm and a width of 2.0 cm?

Accepted Answer

A) -2.5 diopters 
B) -0.50 diopters 
C) +4.0 diopters 
D) +2.5 diopters 
E) -50 diopters 
A) -2.5 diopters 
B) -0.50 diopters 
C) +4.0 diopters 
D) +2.5 diopters 
E) -50 diopters

Question 17

A nearsighted person has a far point of 18 cm.What power contact lenses will allow this person to comfortably see distant objects clearly?

Accepted Answer

A) +5.6 diopters 
B) -5.6 diopters 
C) +0.056 diopters 
D) -0.056 diopters 
A) +5.6 diopters 
B) -5.6 diopters 
C) +0.056 diopters 
D) -0.056 diopters

Question 18

A nearsighted person cannot see objects beyond 80 cm from his eyes.Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to comfortably see the distant objects clearly?

Accepted Answer

A) +80 cm, +1.3 diopters 
B) -80 cm, +1.3 diopters 
C) +80 cm, -1.3 diopters 
D) -80 cm, -1.3 diopters 
E) -1.3 cm, +1.3 diopters 
A) +80 cm, +1.3 diopters 
B) -80 cm, +1.3 diopters 
C) +80 cm, -1.3 diopters 
D) -80 cm, -1.3 diopters 
E) -1.3 cm, +1.3 diopters

Question 19

What is the angular magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye having a near point of 25 cm?

Accepted Answer

A) 2.0 
B) 3.0 
C) 3.6 
D) 4.0 
E) 6.3 
A) 2.0 
B) 3.0 
C) 3.6 
D) 4.0 
E) 6.3

Question 20

A plant that is 4.0 cm tall is placed 15 cm from a concave spherical mirror having a focal length of magnitude 20 cm.Where is the image located?

Accepted Answer

A) 12 cm behind the mirror 
B) 12 cm in front of the mirror 
C) 60 cm behind the mirror 
D) 60 cm in front of the mirror 
A) 12 cm behind the mirror 
B) 12 cm in front of the mirror 
C) 60 cm behind the mirror 
D) 60 cm in front of the mirror

Exam 23: Mirrors and Lenses

What power contact lens is needed to correct for farsightedness where the uncorrected near point is 75 cm?

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

An object is placed on the left side of a thin lens,and the image of this object is formed on the left side of the lens.Which of the following statements must be true? (There could be more than one correct choice.)

A coin is 12 cm in front of a convex lens with focal length of magnitude 4.0 cm.Where is the image?

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.)

Mahmood is farsighted and cannot see objects clearly that are closer to his eye than 80.0 cm.What is the focal length of the contact lenses that will enable him to comfortably see objects at a distance of 25.0 cm from his eyes?

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?

What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is at 60 cm?

In a compound microscope

A student wishing to build a telescope has available an eyepiece of focal length -5.0 cm.What focal length objective is needed to obtain a magnification of 10?

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?

Suppose you place an object in front of a concave mirror.Which of the following statements must be true? (There could be more than one correct choice.)

What is the power of a lens that has a focal length of -40 cm and a width of 2.0 cm?

A nearsighted person has a far point of 18 cm.What power contact lenses will allow this person to comfortably see distant objects clearly?

A nearsighted person cannot see objects beyond 80 cm from his eyes.Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to comfortably see the distant objects clearly?

What is the angular magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye having a near point of 25 cm?

A plant that is 4.0 cm tall is placed 15 cm from a concave spherical mirror having a focal length of magnitude 20 cm.Where is the image located?

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