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

total internal reflection

Problem 43.

A point source of light is 60 cm below the surface of water. Find the diameter of circle at the surface through which light emerges from the water.

Solution

Problem 44.

The index of refraction of liquid is 1.9. What is the critical angle for a light ray travelling in the liquid toward a flat layer of air?

Solution

Problem 45.

A light ray is perpendicular to the face AB of a glass prism (index of refraction = 1.4). Find the largest value for angle  so that the ray is totally reflected at face BC. The prism is immersed in air.

Problem 46.

A light ray enters a glass slab at incident angle  as shown in the figure. Then it undergoes total internal reflection. What is the minimum value of the index of refraction of the slab?

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?

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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