Question

Define total internal reflection of light. name the device in which total internal reflection of light is used​

Answer 1

Answer:

The phenomenon of total internal reflection of light is used in many optical instruments like telescopes, microscopes, binoculars, spectroscopes, periscopes etc. The brilliance of a diamond is due to total internal reflection. Optical fibre works on the principle of total internal reflection.

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Answer 2

Reflection of a ray of light as a result of refraction from a denser medium to a rarer medium due to sufficiently larger angle of incident in the interface of the medium.

Explanation:

• Reflection of a ray of light as a result of refraction from a denser medium to a rarer medium due to sufficiently larger angle of incident in the interface of the medium.

• As we know that when a ray passes from a denser medium to a rarer medium it speeds up and bends away from the normal except when it incidents at zero degree angle to the normal.

• When we keep on increasing this angle of incidence we get a situation when the refracted ray passes on the interface of the two medium due to excess bending away. This angle of incident on the interface of the two medium is called critical angel.

• And if the angle of incident is greater than critical angle then the rays bend so much away from the normal that they reflect without getting into the rarer medium. This phenomenon is called total internal reflection.

For total internal reflection the angle of refraction is greater than 90 degrees.

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TOPIC: total internal reflection

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