Question

Light travels from diamond to glass, glass to water and water to all. In this context when does total internal reflection may take place?
$1$. When light travels from diamond to glass
$2$. When light travels from glass to water
$3$. When light travels from water to air
Select the correct answer from the codes given.

• A. $2$ and $3$ only
• B. $1$ and $2$ only
• C. $1,2$ and $3$
• D. $1$ and $3$ only

Answer 1

The correct option is C $1,2$ and $3$

Refractive index is of the order :

diamond > glass > water > air

All are moving from denser to rarer medium. Hence, its necessary condition.