Free problems arranged by topic
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

 Free problems: all problems
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

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# Physics problems:Optics

Part 6

Problem 51.

A diamond is under water. A light ray enters one face of the diamond (index of refraction is 2.4), then travels at an angle of  with respect to the normal. What was the ray’s angle of incidence on the diamond? Index of refraction of water is 1.33.

Problem 52.

An underwater diver sees the sun  above the horizontal. How high is the sun above the horizon to a fisherman in a boat above the diver?

Solution

Problem 53.

To a fish in an aquarium, the 6-mm-thick walls appear to be only 5-mm-think. What is the index of refraction of the walls?

Solution

Problem 54.

To a fish in an aquarium, the walls appear to be only 7-mm-think. The index of refraction of the walls is 1.9. What is the actual thickness of the walls?

Solution

Problem 55.

A 1.5-cm-diameter spider is 50 cm from a wall. Determine the focal length and the position (measured from the wall) of the lens that will make a half-size image of the spider on the wall.

Problem 56.

A 2.0-cm-tall object is 3.0 m from a wall. How many places can you put the lens with the focal length of 40 cm to form a well-focused image of the object on the wall?

Solution

Problem 57.

Light enters a glass at an angle of incidence of . The index of refraction of the glass is 1.6. What is the angle of refraction?

Solution

Problem 58.

Light going from glass (index of refraction = 1.4) to ethanol has a critical angle of incidence of . What is the index of refraction of ethanol?

Solution

Problem 59.

The index of refraction of benzene is 1.5. What is the velocity of light in benzene?

Solution

Problem 60.

Find the critical angle for total internal reflection for light going from ice (index of refraction = 1.31) into air.

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