Ans 22 question!!! Pls

Dear Student

For best results, the following conditions must be satisfied:

1. The angle of incidence must be nearly equal to the angle of emergence.

2. The angle of refraction must be less than the angle the incidence.

sini/sinr=1.5 which is the refractive index of the glass

3. Out of the 4 observations, the first observation, that is angle i = 30° ; angle r = 19° and angle e = 29° is the correct observation.

In this case,

sin 30⁰/sin19⁰=1.535

Hence Observation A(I) is correct

Regards