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Exam 23: Mirrors and Lenses

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Question 41

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A girl is standing in front of a concave mirror.Consider two rays of light,one from her nose and one from her mouth that are parallel as they are traveling toward the mirror.These rays will come together:

A) at the focal point.
B) at the center of curvature.
C) at the image point.
D) behind the mirror if she is too close to the mirror.

E) A) and C)
F) C) and D)

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Question 42

Multiple Choice

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An object,located 90 cm from a concave lens,forms an image 60 cm from the lens on the same side as the object.What is the focal length of the lens?

A) -36 cm
B) -75 cm
C) -180 cm
D) -150 cm

E) B) and D)
F) C) and D)

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Question 43

Multiple Choice

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If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror,the required length of the mirror:

Ansel places an object 30 cm from a thin convex lens along the axis.If a real image forms at a distance of 10 cm from the lens,what is the focal length of the lens?

A convex mirror with a focal length of -20 cm forms an image 15 cm behind the surface.If the object height is 1.2 cm what is the image height?

An object is held at a distance of 12 cm from a convex mirror creating an image that is 1/3 the object size.What is the focal length of the mirror?

Which of the following best describes the image for a thin concave lens that forms whenever the magnitude of the object distance is less than that of the lens' focal length?

Parallel rays of light that hit a concave mirror will come together:

Atmospheric refraction of light rays is responsible for:

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

A contact lens is made of plastic with an index of refraction 1.50.The lens has an outer radius of curvature of +2.0 cm and an innerradius of curvature of +2.5 cm.What is its focal length?

Reducing the lens aperture size is a scheme one can use to reduce the occurrence of which of the following effects?

An object placed 12 cm from a concave mirror produces a real image 8.0 cm from the mirror.If the object is now moved to a new position 18.0 cm from the mirror,where is the new image located as measured from the mirror?

If a virtual image is formed along the principal axis 10 cm from a concave mirror with the focal length 15 cm,what is the object distance from the mirror?

A 100-cm focal length thin lens is placed in contact with one of 66.7 cm focal length.A 3.0 cm tall object is placed 50 cm in front of the combination.What is the size of the image?

Two thin lenses with 10.0-cm focal lengths at are mounted at opposite ends of a 30.0-cm long tube.An object is located 45.0 cm from one end of the tube.How far from the opposite end is the final image?

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?

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

A converging lens with two convex surfaces has a front surface with radius of curvature of 10.0 cm;the back surface has radius of curvature of 20.0 cm,and it is made from material with an index of refraction of 2.50.What is the focal length of the lens?

Three thin lenses,each of focal length f,are placed in contact.What is the resulting focal length of the combination?