Light goes from material having a refractive index of n1 into a material with refractive index n2. If the refracted light is bent away from the normal, what can you conclude about the indices of refraction?

A) n1 > n2 B) n1 ≥ n2 C) n1 2 D) n1 ≤ n2 E) n1 = n2 A) n1 > n2 B) n1 ≥ n2 C) n1 2 D) n1 ≤ n2 E) n1 = n2

Exam 18: Ray Optics

A 4.0-cm tall apple is 20 cm in front of a plano-convex lens of focal length 75 cm. (a) Find the location of the image of the apple. Is it a real or a virtual image? (b) How tall is the image of the apple? Is it upright or inverted?

(Short Answer)

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Question 81

A point source of light is positioned 20.0 m below the surface of a lake. What is the diameter of the largest circle on the surface of the water through which light can emerge into the air? The index of refraction of water is 1.33.

(Short Answer)

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Question 82

If a spherical concave mirror has a radius of curvature R, its focal length is

(Multiple Choice)

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Question 83

A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?

(Multiple Choice)

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Question 84

A tank holds a layer of oil, of thickness T_o = 1.43 m, that floats on a layer of syrup of thickness T_s = 0.640 m, as shown in the figure. Both liquids are clear and do not mix together. A light ray, originating at the bottom of the tank at point P, crosses the oil-syrup interface at a point 0.900 m from the axis. The ray continues and arrives at the oil-air interface, 2.00 m to the right of P and at the critical angle. What is the index of refraction of the oil? $A tank holds a layer of oil, of thickness T<sub>o</sub> = 1.43 m, that floats on a layer of syrup of thickness T<sub>s</sub> = 0.640 m, as shown in the figure. Both liquids are clear and do not mix together. A light ray, originating at the bottom of the tank at point P, crosses the oil-syrup interface at a point 0.900 m from the axis. The ray continues and arrives at the oil-air interface, 2.00 m to the right of P and at the critical angle. What is the index of refraction of the oil?$

(Multiple Choice)

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Question 85

As shown in the figure, a laser positioned on a ship is used to communicate with a small research submarine resting on the bottom of a lake. The laser is positioned 12 m above the surface of the water, and it strikes the water 20 m from the side of the ship. The water is 58 m deep and has an index of refraction of 1.33. How far horizontally is the submarine from the side of the ship? (Assume all numbers are accurate to three significant figures.) $As shown in the figure, a laser positioned on a ship is used to communicate with a small research submarine resting on the bottom of a lake. The laser is positioned 12 m above the surface of the water, and it strikes the water 20 m from the side of the ship. The water is 58 m deep and has an index of refraction of 1.33. How far horizontally is the submarine from the side of the ship? (Assume all numbers are accurate to three significant figures.)$

(Multiple Choice)

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Question 86

Tan's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and upright, what is the focal length of the mirror?

(Multiple Choice)

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Question 87

A person jogs toward a plane mirror at a speed of 3 m/s. How fast is he approaching his image in the mirror?

(Multiple Choice)

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Question 88

A beam of light that is parallel to the principal axis strikes a convex mirror. What happens to the reflected beam of light?

(Multiple Choice)

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Question 89

An object that is 10.0 cm tall is placed 37.0 cm in front of a concave mirror of focal length 18.5 cm. How tall is the image?

(Multiple Choice)

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Question 90

A drawing is placed 40 cm in front of a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the drawing, what is the focal length of the lens?

(Multiple Choice)

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Question 91

An object is placed in front of a thin lens. Which statements are correct in describing the image formed by the lens? (There could be more than one correct choice.)

(Multiple Choice)

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Question 92

A laser beam strikes a plane mirror's reflecting surface with an angle of incidence of 43°. What is the angle between the incident ray and the reflected ray?

(Multiple Choice)

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Question 93

A glass plate having an index of refraction is 1.66 is immersed in a certain alcohol. The surface of the glass is inclined at an angle of 44° with the vertical. When a horizontal ray in the glass strikes the interface, you observe that it is at the critical angle. What is the index of refraction of the alcohol?

(Multiple Choice)

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Question 94

Light goes from material having a refractive index of n₁ into a material with refractive index n₂. If the refracted light is bent away from the normal, what can you conclude about the indices of refraction?

(Multiple Choice)

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Question 95

A lab specimen is 15.2 mm from a converging lens. The image is 4.0 mm tall and 9.0 cm from the lens. How tall is the specimen?

(Multiple Choice)

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Question 96

Which of the following terms describe lenses that are thinner at the center than at the edges? (There could be more than one correct choice.)

(Multiple Choice)

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Question 97

A narrow light beam in vacuum contains light of two wavelengths, 480 nm and 700 nm. It strikes a flat piece of glass at an angle of incidence of 60.000°. The index of refraction of the glass is 1.4830 at 480 nm and 1.4760 at 700 nm. Determine the angle between the two wavelengths as the light travels in the glass.

(Short Answer)

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Question 98

A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?

(Multiple Choice)

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Question 99

A coin is 12 cm in front of a converging lens with focal length of magnitude 4.0 cm. Where is the image?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 155

Exam 18: Ray Optics

A 4.0-cm tall apple is 20 cm in front of a plano-convex lens of focal length 75 cm. (a) Find the location of the image of the apple. Is it a real or a virtual image? (b) How tall is the image of the apple? Is it upright or inverted?

A point source of light is positioned 20.0 m below the surface of a lake. What is the diameter of the largest circle on the surface of the water through which light can emerge into the air? The index of refraction of water is 1.33.

If a spherical concave mirror has a radius of curvature R, its focal length is

A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?

Tan's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and upright, what is the focal length of the mirror?

A person jogs toward a plane mirror at a speed of 3 m/s. How fast is he approaching his image in the mirror?

A beam of light that is parallel to the principal axis strikes a convex mirror. What happens to the reflected beam of light?

An object that is 10.0 cm tall is placed 37.0 cm in front of a concave mirror of focal length 18.5 cm. How tall is the image?

A drawing is placed 40 cm in front of a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the drawing, what is the focal length of the lens?

An object is placed in front of a thin lens. Which statements are correct in describing the image formed by the lens? (There could be more than one correct choice.)

A laser beam strikes a plane mirror's reflecting surface with an angle of incidence of 43°. What is the angle between the incident ray and the reflected ray?

Light goes from material having a refractive index of n1 into a material with refractive index n2. If the refracted light is bent away from the normal, what can you conclude about the indices of refraction?

A lab specimen is 15.2 mm from a converging lens. The image is 4.0 mm tall and 9.0 cm from the lens. How tall is the specimen?

Which of the following terms describe lenses that are thinner at the center than at the edges? (There could be more than one correct choice.)

A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?

A coin is 12 cm in front of a converging lens with focal length of magnitude 4.0 cm. Where is the image?

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Light goes from material having a refractive index of n₁ into a material with refractive index n₂. If the refracted light is bent away from the normal, what can you conclude about the indices of refraction?