Question

what is total internal reflection what are the conditions for it​

Answer 1

Total internal reflection, in physics, complete reflection of a ray of light within a medium such as water or glass from the surrounding surfaces back into the medium. The phenomenon occurs if the angle of incidence is greater than a certain limiting angle, called the critical angle.

total internal reflection, these conditions must be met they are:

• the light must be travelling from a denser to rarer medium

• angle of incidence must be larger than the critical angle

• critical angle is nothing but the angle of incidence for which the angle of refraction is 90 degree

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Answer 2

Answer:

the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds there critical angle

condition

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. Ray must travel from denser to rarer medium