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Exam 18: Images

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Question 1

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The focal length of a spherical mirror is N times its radius of curvature where N is:

A) 1/4
B) 1/2
C) 1
D) 2
E) 4

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Question 2

Multiple Choice

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A parallel beam of monochromatic light in air is incident on a plane glass surface. In the glass, the beam:

A) remains parallel
B) undergoes dispersion
C) becomes diverging
D) follows a parabolic path
E) becomes converging

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Question 3

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A 3-cm high object is in front of a thin lens. The object distance is 4 cm and the image distance is -8 cm. The image height is:

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

A converging lens of focal length 20 cm is placed in contact with a diverging lens of focal length 30 cm. The focal length of this combination 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:

In a cinema, a picture 2.5 cm wide on the film is projected to an image 3.0 m wide on a screen which is 18 m away. The focal length of the lens is about:

A camera with a lens of focal length 6.0 cm takes a picture of a 1.4-m man standing 11 m away. The height of the image is about:

A ball is held 50 cm in front of a plane mirror. The distance between the ball and its image is:

A magnifying glass has a focal length of 15 cm. If the near point of the eye is 25 cm from the eye the angular magnification of the glass is about:

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

A plane mirror is in a vertical plane and is rotating about a vertical axis at 100 rpm. A horizontal beam of light is incident on the mirror. The reflected beam will rotate at:

A concave mirror forms a real image which is twice the size of the object. If the object is 20 cm from the mirror, the radius of curvature of the mirror must be about:

In a two lens microscope, the intermediate image is:

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

Consider the following four statements concerning a compound microscope: I. Each lens produces an image that is virtual and inverted. II. The objective lens has a very short focal length. III. The eyepiece is used as a simple magnifying glass. IV. The objective lens is convex and the eyepiece is concave. Which two of the four statements are correct?

Let p denote the object-lens distance and i the image-lens distance. The image produced by a lens of focal length f has a height that can be obtained from the object height by multiplying it by: