KVPY SA Exam 19-Nov-2017 Question Paper

Question : 68 of 80

Marks: +1, -0

A ray of light originates from inside a glass slab and is incident on its inner surface at an angle θ as shown,

In this experiment the location x of the spot where the ray hits the screen is recorded. Which of the following correctly shows the plot of variation of x with the angle θ ?

Validate

Solution:

This is case of Total Internal Reflector
(90– θ) is incident angle. As θ increases thus incident
angle decreaes. Initially Ray will be Reflected
at

θ_C

angle will be TIR after words Refraction takes place

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