Question 1

A refracting telescope has a magnification M.If the focal length of the objective lens is doubled and the eyepiece focal length is halved,what is the new magnification?

Accepted Answer

A) 4M 
B) 2M 
C) M/2 
D) M/4 
E) M 
A) 4M 
B) 2M 
C) M/2 
D) M/4 
E) M

Question 2

How far from a lens having a focal length of +50 mm must the object be placed if it is to form a virtual image that is 3.0 times the size of the object?

Accepted Answer

A) 33 mm 
B) 42 mm 
C) 48 mm 
D) 54 mm 
A) 33 mm 
B) 42 mm 
C) 48 mm 
D) 54 mm

Question 3

A simple digital camera lens with focal length $f _ { 0 } = 3.00 \mathrm {~cm}$ perfectly focuses the image of an object on a CCD sensor located a distance $14.00 \mathrm {~cm}$ away from the lens.The object now moves away from the lens and the new distance between the lens and sensor is $13.00 \mathrm {~cm}$ (a)By what amount did the object change its distance from the lens? (b)What is the new magnification?

Accepted Answer

A) (a)0.08 cm (b)3.33 
B) (a)0.03 cm (b)0.30 
C) (a)990.00 cm (b)0.23 
D) (a)12.22 cm (b)4.33 
A) (a)0.08 cm (b)3.33 
B) (a)0.03 cm (b)0.30 
C) (a)990.00 cm (b)0.23 
D) (a)12.22 cm (b)4.33

Question 4

A person's hyperopic (farsighted)eye can focus on objects that are 75 cm away and farther.What power and what focal length contact lenses should be prescribed so this person can see objects 25 cm and farther from the eye?

Accepted Answer

The answer of A person's hyperopic (farsighted)eye can focus on...

Question 5

An image is 4.0 mm in front of a convex lens with focal length of magnitude 5.0 mm.Where is the object for this image?

Accepted Answer

A) 2.2 mm in front of the lens 
B) 2.2 mm behind the lens 
C) 9.0 mm behind the lens 
D) 20 mm in front of the lens 
A) 2.2 mm in front of the lens 
B) 2.2 mm behind the lens 
C) 9.0 mm behind the lens 
D) 20 mm in front of the lens

Question 6

A 1.4-cm tall flower is 4.0 cm from a spherical concave mirror.If the image of the flower is 4.0 cm tall,how far is the image from the mirror?

Accepted Answer

A) 11 cm 
B) 9.4 cm 
C) 1.4 cm 
D) 0.090 cm 
A) 11 cm 
B) 9.4 cm 
C) 1.4 cm 
D) 0.090 cm

Question 7

A 14-mm tall postage stamp is 4.0 mm from a convex lens.If the image of the stamp is 4.0 mm tall,how far is it from the lens?

Accepted Answer

A) 14 mm 
B) 8.7 mm 
C) 1.4 mm 
D) 1.1 mm 
A) 14 mm 
B) 8.7 mm 
C) 1.4 mm 
D) 1.1 mm

Question 8

Which statements about images are correct? (There could be more than one correct choice.)

Accepted Answer

A) A virtual image cannot be formed on a screen. 
B) A virtual image cannot be viewed by the unaided eye. 
C) A virtual image cannot be photographed. 
D) A real image must be erect. 
E) Mirrors always produce real images because they reflect light. 
A) A virtual image cannot be formed on a screen. 
B) A virtual image cannot be viewed by the unaided eye. 
C) A virtual image cannot be photographed. 
D) A real image must be erect. 
E) Mirrors always produce real images because they reflect light.

Question 9

A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror.How far is the object from the mirror?

Accepted Answer

A) 20 cm 
B) 15 cm 
C) 7.5 cm 
D) 5.0 cm 
A) 20 cm 
B) 15 cm 
C) 7.5 cm 
D) 5.0 cm

Question 10

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 11

A lens of focal length 90 mm is used as a magnifier by a person with a near point of 25 cm.The object being viewed is 9.9 mm long,and is positioned at the focal point of the lens.What is the angle subtended by the image at infinity,in milliradians?

Accepted Answer

A) 110 mrad 
B) 73 mrad 
C) 37 mrad 
D) 147 mrad 
E) 183 mrad 
A) 110 mrad 
B) 73 mrad 
C) 37 mrad 
D) 147 mrad 
E) 183 mrad

Question 12

Which of following statements about the image formed by a single concave 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) The image is always smaller than the object. 
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) The image is always smaller than the object.

Question 13

A magnifying glass has a focal length of 7.0 cm.What is the angular magnification if the image is viewed by a person having a relaxed eye with the near point of 25 cm?

Accepted Answer

A) 1.6 
B) 2.6 
C) 3.6 
D) 4.6 
A) 1.6 
B) 2.6 
C) 3.6 
D) 4.6

Question 14

Single concave 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 smaller than, larger than, or the same size as the actual object, depending on the placement of the object. 
E) are always 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 smaller than, larger than, or the same size as the actual object, depending on the placement of the object. 
E) are always real.

Question 15

Which of following statements about the image formed by a single convex 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 16

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 17

The focal length of the objective lens of a telescope is 0.20 m and the eyepiece has a focal length of 1.6 m.What is the length of this telescope?

Accepted Answer

A) 8.0 m 
B) 1.4 m 
C) 0.90 m 
D) 1.6 m 
E) 1.8 m 
A) 8.0 m 
B) 1.4 m 
C) 0.90 m 
D) 1.6 m 
E) 1.8 m

Question 18

An object is placed near a concave mirror having a radius of curvature of magnitude 60 cm.How far should you place the object from the mirror so that the lateral magnification produced by the mirror will be +2.5?

Accepted Answer

A) 18 cm 
B) 24 cm 
C) 30 cm 
D) 36 cm 
E) 42 cm 
A) 18 cm 
B) 24 cm 
C) 30 cm 
D) 36 cm 
E) 42 cm

Question 19

A lens of focal length 40 mm is used as a magnifier.The object being viewed is 5.3 mm long,and is positioned at the focal point of the lens.The user of the magnifier has a near point at 25 cm.What is the angular magnification of the magnifier?

Accepted Answer

A) 6.3 
B) 5.6 
C) 6.9 
D) 7.5 
E) 8.1 
A) 6.3 
B) 5.6 
C) 6.9 
D) 7.5 
E) 8.1

Question 20

When an object is 12 cm in front of a concave mirror,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

Exam 23: Mirrors and Lenses

A refracting telescope has a magnification M.If the focal length of the objective lens is doubled and the eyepiece focal length is halved,what is the new magnification?

How far from a lens having a focal length of +50 mm must the object be placed if it is to form a virtual image that is 3.0 times the size of the object?

A person's hyperopic (farsighted)eye can focus on objects that are 75 cm away and farther.What power and what focal length contact lenses should be prescribed so this person can see objects 25 cm and farther from the eye?

An image is 4.0 mm in front of a convex lens with focal length of magnitude 5.0 mm.Where is the object for this image?

A 1.4-cm tall flower is 4.0 cm from a spherical concave mirror.If the image of the flower is 4.0 cm tall,how far is the image from the mirror?

A 14-mm tall postage stamp is 4.0 mm from a convex lens.If the image of the stamp is 4.0 mm tall,how far is it from the lens?

Which statements about images are correct? (There could be more than one correct choice.)

A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror.How far is the object from the mirror?

Single convex spherical mirrors produce images that

A lens of focal length 90 mm is used as a magnifier by a person with a near point of 25 cm.The object being viewed is 9.9 mm long,and is positioned at the focal point of the lens.What is the angle subtended by the image at infinity,in milliradians?

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

A magnifying glass has a focal length of 7.0 cm.What is the angular magnification if the image is viewed by a person having a relaxed eye with the near point of 25 cm?

Single concave spherical mirrors produce images that

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

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?

The focal length of the objective lens of a telescope is 0.20 m and the eyepiece has a focal length of 1.6 m.What is the length of this telescope?

An object is placed near a concave mirror having a radius of curvature of magnitude 60 cm.How far should you place the object from the mirror so that the lateral magnification produced by the mirror will be +2.5?

A lens of focal length 40 mm is used as a magnifier.The object being viewed is 5.3 mm long,and is positioned at the focal point of the lens.The user of the magnifier has a near point at 25 cm.What is the angular magnification of the magnifier?

When an object is 12 cm in front of a concave mirror,the image is 3.0 cm in front of the mirror? What is the focal length of the mirror?

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