Question 1

A concave refracting surface of a medium with index of refraction n produces a real image no matter where an object is placed outside:

Accepted Answer

A) always 
B) only if the index of refraction of the surrounding medium is less than n 
C) only if the index of refraction of the surrounding medium is greater than n 
D) never 
E) none of the above 
A) always 
B) only if the index of refraction of the surrounding medium is less than n 
C) only if the index of refraction of the surrounding medium is greater than n 
D) never 
E) none of the above

Question 2

If the image distance is negative,

Accepted Answer

A) the image is real. 
B) the image is virtual. 
C) the lens is converging. 
D) the object distance must also be negative. 
E) this is not possible; the image distance must be positive. 
A) the image is real. 
B) the image is virtual. 
C) the lens is converging. 
D) the object distance must also be negative. 
E) this is not possible; the image distance must be positive.

Question 3

Which of the following is true of all virtual images?

Accepted Answer

A) They can be seen but not photographed 
B) They appear only briefly 
C) They are smaller than the objects 
D) They are larger than the objects 
E) None of the above 
A) They can be seen but not photographed 
B) They appear only briefly 
C) They are smaller than the objects 
D) They are larger than the objects 
E) None of the above

Question 4

The object-lens distance for a certain converging lens is 400 mm.The image is three times the size of the object.To make the image five times the size of the object, the object-lens distance must be changed to:

Accepted Answer

A) 360 mm 
B) 540 mm 
C) 600 mm 
D) 720 mm 
E) 960 mm 
A) 360 mm 
B) 540 mm 
C) 600 mm 
D) 720 mm 
E) 960 mm

Question 5

An erect object is 2f in front of a convex lens of focal length f.The image is:

Accepted Answer

A) real, inverted, magnified 
B) real, erect, same size 
C) real, inverted, same size 
D) virtual, inverted, reduced 
E) real, inverted, reduced 
A) real, inverted, magnified 
B) real, erect, same size 
C) real, inverted, same size 
D) virtual, inverted, reduced 
E) real, inverted, reduced

Question 6

Which of the following five glass lenses is a diverging lens?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 7

A plano-convex glass (n = 1.5)lens has a curved side whose radius is 50 cm.If the image size is to be the same as the object size, the object should be placed at a distance from the lens of:

Accepted Answer

A) 50 cm 
B) 100 cm 
C) 200 cm 
D) 340 cm 
E) 400 cm 
A) 50 cm 
B) 100 cm 
C) 200 cm 
D) 340 cm 
E) 400 cm

Question 8

An ordinary magnifying glass in front of an erect object produces an image that is:

Accepted Answer

A) real and erect 
B) real and inverted 
C) virtual and inverted 
D) virtual and erect 
E) none of these 
A) real and erect 
B) real and inverted 
C) virtual and inverted 
D) virtual and erect 
E) none of these

Question 9

The Sun subtends 0.5$\degree$ as seen from the Earth.Its image, using a 1.0-m focal length lens, is about:

Accepted Answer

A) 10 cm 
B) 2 cm 
C) 1 cm 
D) 5 mm 
E) 1 mm 
A) 10 cm 
B) 2 cm 
C) 1 cm 
D) 5 mm 
E) 1 mm

Question 10

An erect object is in front of a convex mirror a distance greater than the focal length.The image is:

Accepted Answer

A) real, inverted, and smaller than the object 
B) virtual, inverted, and larger than the object 
C) real, inverted, and larger than the object 
D) virtual, erect, and smaller than the object 
E) real, erect, and larger than the object 
A) real, inverted, and smaller than the object 
B) virtual, inverted, and larger than the object 
C) real, inverted, and larger than the object 
D) virtual, erect, and smaller than the object 
E) real, erect, and larger than the object

Question 11

Which type(s)of lenses can produce both real and virtual images?

Accepted Answer

A) only diverging lenses 
B) only converging lenses 
C) only plane lenses 
D) both converging and diverging lenses 
E) neither converging nor diverging lenses 
A) only diverging lenses 
B) only converging lenses 
C) only plane lenses 
D) both converging and diverging lenses 
E) neither converging nor diverging lenses

Question 12

A convex spherical refracting surface separates a medium with index of refraction 2 from air.The image of an object outside the surface is real:

Accepted Answer

A) always 
B) never 
C) only if it is close to the surface 
D) only if its distance from the surface is large compared to the radius of curvature 
E) only if the radius of curvature is small 
A) always 
B) never 
C) only if it is close to the surface 
D) only if its distance from the surface is large compared to the radius of curvature 
E) only if the radius of curvature is small

Question 13

A point source is to be used with a concave mirror to produce a beam of parallel light.The source should be placed:

Accepted Answer

A) as close to the mirror as possible 
B) at the center of curvature 
C) midway between the center of curvature and the focal point 
D) midway between the center of curvature and the mirror 
E) midway between the focal point and the mirror 
A) as close to the mirror as possible 
B) at the center of curvature 
C) midway between the center of curvature and the focal point 
D) midway between the center of curvature and the mirror 
E) midway between the focal point and the mirror

Question 14

Two plane mirrors make an angle of 120$\degree$ with each other.The maximum number of images of an object placed between them is:

Accepted Answer

A) one 
B) two 
C) three 
D) four 
E) more than four 
A) one 
B) two 
C) three 
D) four 
E) more than four

Question 15

An erect object placed outside the focal point of a converging lens will produce an image that is:

Accepted Answer

A) erect and virtual 
B) inverted and virtual 
C) erect and real 
D) inverted and real 
E) impossible to locate 
A) erect and virtual 
B) inverted and virtual 
C) erect and real 
D) inverted and real 
E) impossible to locate

Question 16

Two thin lenses (focal lengths f1 and f2)are in contact.Their equivalent focal length is:

Accepted Answer

A) f1 + f2 
B) f1f2/(f1 + f2) 
C) 1/f1 + 1/f2 
D) f1 - f2 
E) f1(f1 - f2)/f2 
A) f1 + f2 
B) f1f2/(f1 + f2) 
C) 1/f1 + 1/f2 
D) f1 - f2 
E) f1(f1 - f2)/f2

Question 17

A man stands with his nose 8 cm from a concave shaving mirror of radius 32 cm.The distance from the mirror to the image of his nose is:

Accepted Answer

A) 8 cm 
B) 12 cm 
C) 16 cm 
D) 24 cm 
E) 32 cm 
A) 8 cm 
B) 12 cm 
C) 16 cm 
D) 24 cm 
E) 32 cm

Question 18

If the image distance is negative,

Accepted Answer

A) the image is real. 
B) the image is virtual. 
C) the mirror is concave. 
D) you have made a mistake; image distances must be positive. 
E) the object distance must also be negative. 
A) the image is real. 
B) the image is virtual. 
C) the mirror is concave. 
D) you have made a mistake; image distances must be positive. 
E) the object distance must also be negative.

Exam 34: Images

A concave refracting surface of a medium with index of refraction n produces a real image no matter where an object is placed outside:

If the image distance is negative,

Which of the following is true of all virtual images?

The object-lens distance for a certain converging lens is 400 mm.The image is three times the size of the object.To make the image five times the size of the object, the object-lens distance must be changed to:

An erect object is 2f in front of a convex lens of focal length f.The image is:

Which of the following five glass lenses is a diverging lens?

A plano-convex glass (n = 1.5)lens has a curved side whose radius is 50 cm.If the image size is to be the same as the object size, the object should be placed at a distance from the lens of:

An ordinary magnifying glass in front of an erect object produces an image that is:

The Sun subtends 0.5 °\degree° as seen from the Earth.Its image, using a 1.0-m focal length lens, is about:

An erect object is in front of a convex mirror a distance greater than the focal length.The image is:

Which type(s)of lenses can produce both real and virtual images?

A convex spherical refracting surface separates a medium with index of refraction 2 from air.The image of an object outside the surface is real:

A point source is to be used with a concave mirror to produce a beam of parallel light.The source should be placed:

Two plane mirrors make an angle of 120 °\degree° with each other.The maximum number of images of an object placed between them is:

An erect object placed outside the focal point of a converging lens will produce an image that is:

Two thin lenses (focal lengths f1 and f2)are in contact.Their equivalent focal length is:

A man stands with his nose 8 cm from a concave shaving mirror of radius 32 cm.The distance from the mirror to the image of his nose is:

If the image distance is negative,

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The Sun subtends 0.5 $\degree$ as seen from the Earth.Its image, using a 1.0-m focal length lens, is about:

Two plane mirrors make an angle of 120 $\degree$ with each other.The maximum number of images of an object placed between them is:

Two thin lenses (focal lengths f₁ and f₂)are in contact.Their equivalent focal length is: