An under water swimmer looks upward at an unobstructed overcast sky. The vertex angle does the sky appear to subtend at the eye of swimmer is (critical angle for water air interface is C)

A fish looks upward at an unobstructed overcast sky. What total angle does the sky appear to subten?(Take refractive index of water as sqrt(2).)

A fish looks upward at an unobstructed overcast sky. What total angle does the sky appear to subten?(Take refractive index of water as sqrt(2).)

Polarising angle for water is 53 8'. Find the critical angle for air-water interface.

A fish in tank sees the outside world as if it is at the vertex of a cone such that the circular base of the cone is at the surface of the water.If the depth of the fish is d and the critical angle for water-air interface is C,what is the radius of circle?

State the approximate value of the critical angle for (a) glass-air surface (b) water-air surface.

A diver in water looks obliquely at an object AB in air. Does the object appear taller, shorter or of the same size to the diver?

Refractive indices for glass and water are (5//3) and (4//3) respectively. The critical angle at the glass-water interface is

Arrange the ascending order of polarising angles for air-glass, air-water, and water-glass interfaces?