A ray of light strikes a cubical slab surrounded by air as shown in the figure. Then the geometrical path length traversed by the light in the slab will be:

A ray of light is incident on a parallel-sided glass slab as shown in the figure. The angle of refraction for this ray of light is likely to be :

A ray of light strikes a glass slab (R.l. = mu ) of finite thickness t. The emerging light is

A ray of light strikes a glass slab (R.l. = mu ) of finite thickness t. The emerging light is

A ray of light strikes the glass slab at an angle of 50^@ .What is the angle of incidence?

A ray of light enters a glass slab ABCD as shown in figure and strikes at the centre O of the circular parth AC of the slab. The critical angle of glass is 42^(@) . Complete the path of the ray till it emerges out from the slab. mark the angles in the diagram wherever necessary.

A ray of light strikes the glass slab at an angle of 50^(@) . What is the angle of incidence ?

A ray of light AO is vacuum is incident on a glass slab at angle 60^@ and refracted at angle 30^@ along OB as shown in the figure.The optical path light ray from A to B is :