Question

plz ans this question

Answer 1

normal

swimming pool appears to have less depth.

critical angle must be more than 48°

Answer 2

For total internal reflection to occur, two conditions must be met: The index of refraction must decrease across the boundary in the direction of light refraction. The angle of incidence of the light ray must exceed the critical angle of the interface.

Total internal reflection is used in double rainbow formation

And when the refraction is 90° the incident rays also would be normal