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Exam 24: Geometrical Optics

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Question 21

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A light ray in air enters and passes through a block of glass. What can be stated with regard to its speed after it emerges from the block?

A) Speed is less than when in glass.
B) Speed is same as that before it entered glass.
C) Speed is same as that in glass.
D) Speed is less than before it entered glass.

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Question 22

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A slab of material 1 rests on the surface of a slab of material 2. A light ray in material 1 has an angle of incidence of 30° on the interface between the materials, while the ray in material 2 has an angle of refraction of 45°. What is the critical angle of incidence for total internal reflection for a ray of light going from material 2 to material 1?

A) 30°
B) 45°
C) In this case there is no critical angle.
D) At least one of the indices of refraction or its equivalent is needed to solve this problem.

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Question 23

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

When light goes through two or more separated lenses,

A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 22.0 cm from the mirror, what is its focal length?

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

A ray of light is incident on the mid-point of a glass prism surface at an angle of 25.0° with the normal. For the glass, n = 1.55, and the prism apex angle is 40.0°. What is the angle of refraction as the ray enters the air on the far side of the prism? The surfaces involved are those of the apex angle.

Which of the lens shapes given below results in a diverging lens?

As the angle of incidence is decreased for a ray incident on a reflecting surface, the angle between the incident and reflected rays ultimately approaches what value?

A light beam is incident upon a still water surface. What is the maximum possible value for the angle of refraction? (n_water = 1.333) .

A ray of light is incident on the mid-point of a glass prism surface at an angle of 20° with the normal. For the glass, n = 1.60, and the prism apex angle is 40°. What is the angle of incidence at the glass-to-air surface on the side opposite where the ray exits the prism? The surfaces involved are those of the apex angle.

Which of the following describes what will happen to a light ray incident on an air-to-glass boundary at less than the critical angle?

A corner cube is formed by three plane mirrors perpendicular to one another resulting in a retroreflector. What is the angle between the directions of an incoming ray of light and of the corresponding outgoing ray of light for this device?

Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror?

An object is held at a distance of 18 cm from a convex mirror creating an image that is 1/6 the object size. What is the focal length of the mirror?

A light ray in air is incident on an air-to-glass boundary at an angle of 30.0° and is refracted in the glass at an angle of 16.7° with the normal. Find the index of refraction of the glass.

Which of the following describes what will happen to a light ray incident on a glass-to-air boundary at greater than the critical angle?

An optical fiber is made of clear plastic with index of refraction n = 1.50. For what angles with the surface will light remain within the plastic "guide"?

When viewing your image in a hand-held mirror, if you move the mirror away at a speed v, the image appears to:

A certain kind of glass has n_blue = 1.650 for blue light and n_red = 1.610 for red light. If a beam of white light (containing all colors) is incident at an angle of 60.0°, what is the angle between the red and blue light inside the glass?