A ray of light originates from inside a glass | vedclass

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Question

(A) As $	heta$ increases,the angle of incidence $i = 90^\circ - 	heta$ decreases.Initially,for small $	heta$,the angle of incidence $i$ is greater

Vedclass · Accepted Answer

$A$

Vedclass · Answer

(A) As $	heta$ increases,the angle of incidence $i = 90^\circ - 	heta$ decreases.Initially,for small $	heta$,the angle of incidence $i$ is greater than the critical angle $i_c$,so total internal reflection $(TIR)$ occurs. The reflected ray hits the screen at a positive height $x = h 	an 	heta$,where $h$ is the distance of the source from the surface. As $	heta$ increases,$x$ increases.When $	heta$ reaches the value such that $i = i_c$,the ray grazes the surface.For $	heta$ greater than this critical value,$i < i_c$,and the ray refracts out of the glass slab. The refracted ray hits the screen below the horizontal axis,making $x$ negative. As $	heta$ increases further,the angle of refraction increases,causing the spot to move further down,making $x$ more negative. Thus,the correct plot is $A$.

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