Question

Ques》A light ray moves from a denser medium to air. The value of critical angle for this interface is 49°. What is the refractive index of this medium? Can you name this medium?
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Chapter- Refraction At Plane Surfaces.

Answer 1

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HERE'S YOUR ANSWER
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The Critical Angle of incidence is defined as the angle of incidence when the angle of refraction is equal to 90°.

Any light ray (passing from denser medium to a rarer medium) falling at angle of incidence greater than the critical angle does not cross the interface between the two media. In spite, it gets reflected back into the same medium.

This phenomenon is known as TOTAL INTERNAL REFLECTION.

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The answer comes out to be :

Refractive index = 1.33 (approximately)

1.33 is the refractive index of WATER.
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