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Exam 23: Mirrors and Lenses

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Question 31

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An object is placed at a distance of 30 cm from a thin convex lens along its axis.The lens has a focal length of 10 cm.What are the values, respectively, of the image distance and magnification?

A) 60 cm and 2.0
B) 15 cm and 2.0
C) 60 cm and -0.50
D) 15 cm and -0.50

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Question 32

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A real object is place a distance d from a converging lens.The object is then moved to a distance 2d from the converging lens.Which of the following statements is false?

A) The image in the first case with the object at distance d can be the larger one.
B) The image in the second case with the object at distance 2d can be the larger one.
C) If both images are real, the image in the second case is smaller.
D) If the image in the first case is real, the image in the second case is upright.

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Question 33

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An object is 12.0 cm from the surface of a spherical Christmas tree ornament that is 8.00 cm in diameter.What is the magnification of the image?

A 100-cm focal length thin lens is placed in contact with one of 66.7 cm focal length. An object is placed 50 cm in front of the combination. What is the image distance?

If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed?

Which of the following best describes the image of a concave mirror when the object's distance from the mirror is less than the focal point distance?

When the reflection of an object is seen in a plane mirror, the image is:

A real object is place to the left of a converging lens and an image forms.Then, to the right of the converging lens a diverging lens is placed.A real, inverted final image forms to the right of the diverging lens.Which of the following could give this result?

How large should a wall-mounted mirror be to view the upper half of one's height, h?

A goldfish is swimming in water (n = 1.33) inside a spherical plastic bowl of index of refraction 1.33.If the goldfish is 10 cm from the front wall of the 15-cm radius bowl, where does the goldfish appear to an observer in front of the bowl?

Use of a parabolic mirror, instead of one made of a circular arc surface, can be used to reduce the occurrence of which of the following effects?

A concave mirror forms a real image at 25.0 cm from the mirror surface along the principal axis.If the corresponding object is at a 10.0-cm distance, what is the mirror's focal length?

A convex mirror with focal length of -20 cm forms an image 12 cm behind the surface.Where is the object located as measured from the surface?

An object 2 cm high is placed 10 cm in front of a mirror.What type of mirror and what radius of curvature is needed for an image that is upright and 4 cm tall?

Atmospheric refraction of light rays is responsible for:

Ellen places an object 40.0 cm from a concave lens.If a virtual image appears 10.0 cm from the lens on the same side as the object, what is the focal length of the lens?

Sally places an object 6.0 cm from a thin convex lens along its axis.The lens has a focal length of 9.0 cm.What are the respective values of the image distance and magnification?

Ron fills a beaker with glycerin (n = 1.473) to a depth of 5.0 cm.If he looks straight down through the glycerin surface, he will perceive the liquid to be what apparent depth?

A 3.0 cm tall object is placed along the principal axis of a thin convex lens of 30.0 cm focal length.If the object distance is 40.0 cm, which of the following best describes the image distance and height, respectively?

The lateral magnification for a flat mirror: