1.

You are given four sources of light each on providing a light of a single colour - red, blue green and yellow. Suppose the angle o refraction for a beam of yellow ligh corresponding to a particular angle o incidence at the interface of two media is 90° Which of the following statements is correct i the source of yellow light is replaced with tha of other lights without changing the angle o incidence ?

Answer»

The beam of red light would undergo tota. 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.

Solution :We have sinC =`(1)/(MU)` = and `mu prop (1)/(LAMBDA)`
`implies sinC prop lambda)`
`implies` If `lambda` decreases then critical angle C will also decrease.
Here among given beams of light, blue light has MINIMUM wavelength and so critical angle for blue light would be minimum and so blue light will undergo TIR. (Total Internal Reflection).


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