NEETPhysicsRay Optics
Material (A ) has critical angle ( ^ A^ ), and material (B ) has critical angle ( ^ a ( _a>/_ ) ). Then which of the following is true (0) Light can be totally internally reflected when it passes from (B ) to (A ) (D) Light can be totally internally reflected when it passes from (A ) to (B ) (iii) Critical angle for total internal reflection is (i_B-i_A ) (iv) Critical angle between (A ) and (B ) is ( ^ ( i_A i_B ) )
Options
- A(i) and (iii)
- B(i) and (iv)
- C(ii) and (iii)
- D(ii) and (iv)
Correct answer
D. (ii) and (iv)
Step-by-step solution
Material B has bigger critical angle therefore is optically less dense than Material A. Total internal reflection can occur only when light passes from optically denser material to optically lighter material. So, statement (ii) is correct. By the definition of critical angle we derive the critical angle. Critical angle (= ) inverse (( ) mewB (/ mewA )= ) inverse (( ) ia (/ ib ) ) Therefore statement (iv) is correct.