Ray Optics Test...

A diver in a swimming pool wants to signal his distress to a person lying on the edge of the pool by flashing his water proof flash light

Finger prints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking it into

The wavelength of light in two liquids \'x\' and \'y\' is3500 Åand 7000 Å, then the critical angle of x relative to y will be

A fish is a little away below the surface of a lake. If the critical angle is 49°, then the fish could see things above the water surface within an angular range of θ° where

For total internal reflection to take place, the angle of incidence i and the refractive index μ of the medium must satisfy the inequality

A transparent solid cylindrical rod has a refractive index of 2/√3.It is surrounded by air. A light ray is incident at the mid-point of one end of the rod as shown in the figure
The incident angle θ for which the light ray grazes along the wall of the rod is

Total internal reflection of a ray of light is possible when the (i_c= critical angle, i = angle of incidence)

Critical angle is that angle of incidence in the denser medium for which the angle of refraction in rarer medium is

The critical angle for diamond (refractive index = 2) is

The reason for shining of air bubble in water is