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You are given four sources of light each one providing a light 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^o. which of the following statements is correct, if the source of yellow light is replaced with that of other lights without changing the angle of incidence?

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

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 red light would undergo total internal reflection

answer is C.

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Detailed Solution

As λ_R $>$ λ_Y $>$ λ_G $>$ λ_Bwe haveμ_B $>$ μ_G $>$ μ_Y $>$ μ_Rthe higher the refractive index the lower the critical angle. Hence, C_R > C_Y>C_G > C_B. So, green and blue will show total internal reflection, while red light will pass.

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