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Exam 18: Ray Optics

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Question 81

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The critical angle for a substance in air is measured at 53.7°. If light enters this substance from air at 45.0° with the normal, at what angle with the normal will it continue to travel?

A) 34.7°
B) 45.0°
C) 53.7°
D) It will not continue, but will be totally reflected.

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Question 82

Multiple Choice

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During the investigation of a new type of optical fiber having an index of refraction $n = 1.21 )$ a laser beam is aimed at the flat end of a straight fiber, as shown in the figure. What is the maximum angle of incidence θ₁ if the beam is not to escape from the sides of the fiber if it is surrounded by air?

A) 42.9°
B) 39.8°
C) 36.7°
D) 33.6°
E) 30.5°

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Question 83

Short Answer

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A statue that is 2.3 cm tall is placed 15 cm in front of a convex mirror. The magnitude of the radius of curvature of the mirror is 18 cm. (a) Is the image real or virtual? (b) How far is the image from the mirror? (c) Is the image upright or inverted? (d) How tall is the image?

A beam of light in water (of refractive index of 1.33) enters a glass slab (of refractive index 1.50) at an angle of incidence of 60.0°. What is the angle of refraction in the glass?

The index of refraction of a type of glass is 1.50, and the index of refraction of water is 1.33. If light enters water from this glass, the angle of refraction will be

A lighted candle is placed a short distance from a plane mirror, as shown in the figure. At which location will the image of the flame appear to be located?

Light enters glass from air. The angle of refraction will be

A light beam with wavelength 440 nm in a certain material then enters air and its wavelength becomes 577 nm. (a) What is the index of refraction for the material? (b) At what angle with the plane of the surface will the light be totally reflected back into the material?

An object is 50 cm from a concave mirror of radius of curvature of magnitude 60 cm. How far is the image from the mirror?

An object that is 2.0 cm tall is placed at the center of curvature in front of a concave mirror. How tall is its image?

A 4.0-cm-tall object is placed 50.0 cm from a diverging lens having a focal length of magnitude 25.0 cm. What is the nature and location of the image?

Suppose you wanted to start a fire using a mirror to focus sunlight. Which of the following statements is most accurate?

When a person stands 40 cm in front of a cosmetic (concave) spherical mirror, the upright image is twice the size of the object. What is the focal length of the mirror?

A 1.4-cm tall flower is 4.0 cm from a spherical concave mirror. If the image of the flower is 4.0 cm tall, how far is the image from the mirror?

A cell phone is placed 40 cm in front of a converging lens with a focal length of magnitude 20 cm. How far is the image of this phone from the lens?