Question

what is tir?? write its conditions
?

Answer 1

TIR : Total internal reflection
if angle of incidence is more than critical angle then incident ray is totally reflected back into same medium, is called total internal reflection.

conditions: 1.incident ray should travel in denser medium and refracted ray should travel in denser medium.
2. angle of incidence should me more than critical angle for given pair of media in contact.

Answer 2

TIR STAND FOR TOTAL INTERNAL REFLECTION
CONDITIONS ARE
1 ANGLE OF INCIDENCE SHOULD BE GREATER THAT CRITICAL ANGLE
2 RAY SHOULD TRAVEL FROM DENSER MEDIUM TO RARER MEDIUM