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Exam 34: Images

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Question 41

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A concave spherical surface with radius r separates a medium with index of refraction 2 from air. As an object in air is moved toward the surface from far away along the central axis, its image:

A) changes from virtual to real when it is a distance r/2 from the surface
B) changes from virtual to real when it is a distance 2r from the surface
C) changes from real to virtual when it is a distance r/2 from the surface
D) changes from real to virtual when it is a distance 2r from the surface
E) remains virtual

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Question 42

Multiple Choice

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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:

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

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Question 43

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The figure shows a concave mirror with a small object located at the point marked 6. If the image is also at this point, then the center of curvature of the mirror is at the point marked:

A candle C sits between two parallel mirrors, a distance 0.2d from mirror 1. Here d is the distance between the mirrors. Multiple images of the candle appear in both mirrors. How far behind mirror 1 are the nearest three images of the candle in that mirror?

Which of the following is NOT correct for a simple magnifying glass?

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:

A man holds a rectangular card in front of and parallel to a plane mirror. In order for him to see the entire image of the card, the least mirror area needed is:

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

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 5.0-ft woman wishes to see a full length image of herself in a plane mirror. The minimum length mirror required is:

Which instrument uses a single converging lens with the object placed just inside the focal point?

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:

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 erect object is placed on the central axis of a thin lens, further from the lens than the magnitude of its focal length. The magnification is +0.4. This means:

An erect object is located between a concave mirror and its focal point. Its image is:

Consider the following four statements concerning a compound microscope: Which two of the four statements are correct?

A virtual image is one:

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: