In this figure a ray of light is projected through glass at varied angles of inc

Question

In this figure a ray of light is projected through glass at varied angles of incidence. Suppose a ray of light inside the glass is incident on the glass-air surface (bottom of glass) in a way that makes the ray on the air side emerge at nearly 90° with respect to the normal. What happens if the angle of the light ray inside the glass hits the surface at an even greater angle relative to the normal?

A) The refraction occurs at the complement of the angle calculated from Snell's law.

B) The light ray cannot escape the glass

C) There is no reflected ray within the glass.

Explanation / Answer

If the emergent ray makes an angle 90 degrees with normal ,this phenomenon is called as Total internal reflection

this total internal reflection takes place when light travels from denser medium(Glass) to rarer medium (air)

Total internal reflection means the emergent ray comes back into the same medium

so if we increase the angle of incidence greater than this value the total light cannot escape the glass

so the answer is B) The light ray cannot escape the glass

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