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Exam 23: Mirrors and Lenses

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Question 31

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An object is placed 40.0 cm to the right of a concave mirror with focal length 24.0 cm and 10.0 cm to the left of a lens with focal length -20.0 cm.Where is the image formed by both the mirror and the lens?

A) 6.67 cm to the right of the object
B) 6.67 cm to the right of the lens
C) 40.0 cm to the right of the lens
D) 20.0 cm to the right of the lens

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Question 32

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

A) Both would be later.
B) Both would be earlier.
C) Sunrise would be later and sunset earlier.
D) Sunrise would be earlier and sunset later.

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Question 33

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When the reflection of an object is seen in a convex mirror the image will:

A container is filled with fluid 1,and the apparent depth of the fluid is 5.00 cm.The container is next filled with fluid 2,and the apparent depth of this fluid is 4.00 cm.If the index of refraction of the first fluid is 1.60,what is the index of refraction of the second fluid?

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 lens of 12.0-cm focal length is placed 20 cm to the right of the object and a mirror of focal length -20.0 cm is placed 50.0 cm to the right of the lens.Where is the final image formed?

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?

When the reflection of an object is seen in a plane mirror,the distance from the mirror to the image depends on:

When an image is inverted compared to the object,it is also:

Two thin lenses with focal lengths 25.0 cm and 30.0 cm are placed in contact in an orientation so that their optic axes coincide.What is the focal length of the two in combination? (Hint: A thin lens is one whose thickness is negligible) .

A container is filled with fluid 1 and the apparent depth of the fluid is 5 cm.The container is next filled with fluid 2,and the apparent depth of this fluid is 4 cm.What is the ratio of the indices of refraction of these fluids?

What is the image distance of an object 1.00 m in front of a converging lens of focal length 20.0 cm?

The real image of an object is located 45.0 cm away from a concave mirror,which has a focal length of 10.0 cm.How far is the object from the mirror?

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?

A glass block,for which n = 1.52,has a blemish located 3.2 cm from one surface.At what distance from that surface does the image of the blemish appear to the outside observer?

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?

Which of the following best describes the image of a concave mirror when the object is at a distance greater than twice the focal point distance from the mirror?

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

A lens has a focal length of 60 cm in air.If this lens were immersed in water,what focal length would result? The index of refraction of the lens is 1.500 and that of water is 1.333.The focal length of a thin lens with index n₁ submerged in a liquid with index n₂ is given by the modified lens maker's formula: .

An eyeglass lens is cut with one surface having a radius R₁ and the other surface having a radius R₂,with R₁ < R₂.Both positive radii are measured from the same side with R₁ being the side closer to the eye.Is this convex-concave lens a converging lens or a diverging lens?