You are given four source of light each one a providing a l…

Physics Ray Optics Total Internal Reflection MCQ (Single Correct)

You are given four source of light each one a providing a light of a single colour of a single colour – red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90 0 . Which of the following statement is correct, if the source of yellow light is replacement with that of other lights without changing the angle of incidence?

The beam of red light would undergo total internal reflection.

The beam of red light would bend towards normal while it gets refracted through the second medium.

The beam of blue light would undergo total internal reflection.

The beam of green light would bend away from the normal as it gets refracted through the second medium.

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The correct answer is:

: Here, for yellow light, when i = C. as I is kept same, C must be smaller for total internal reflection. From will be smallest for blue colour, Therefore, blue light would udergo total internal reflection.

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