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Exam 34: Images

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Question 1

Multiple Choice

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The two lenses shown are illuminated by a beam of parallel light from the left.Lens B is then moved slowly toward lens A.The beam emerging from lens B is:

A) initially parallel and then diverging
B) always diverging
C) initially converging and finally parallel
D) always parallel
E) initially converging and finally diverging

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Question 2

Multiple Choice

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An erect object is located on the central axis of a spherical mirror.The magnification is -3.This means its image is:

A) real, inverted, and on the same side of the mirror
B) virtual, erect, and on the opposite side of the mirror
C) real, erect, and on the same side of the mirror
D) real, inverted, and on the opposite side of the mirror
E) virtual, inverted, and on the opposite side of the mirror

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A

Question 3

Multiple Choice

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

The image produced by a convex mirror of an erect object in front of the mirror is always:

As an object is moved from the center of curvature of a concave mirror toward its focal point its image:

A convex refracting surface has a radius of 12 cm.Light is incident in air (n = 1) and refracted into a medium with an index of refraction of 2.To obtain light with rays parallel to the central axis after refraction a point source should be placed on the axis:

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:

A concave spherical mirror has a focal length of 12 cm.If an erect object is placed 6 cm in front of it:

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

The passenger-side rear view mirror on a car says, "Objects in the mirror may be closer than they appear".Assuming the images are not inverted, this mirror must be:

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:

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 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?

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

A concave spherical mirror has a focal length of 12 cm.If an object is placed 6 cm in front of it the image position is:

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:

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: