Geometrical OpticsHard
Question
A transparent solid cylindrical rod has a refractive index of 
. It is surrounded by air. A light ray is incident at the midpoint of one end of the rod as shown in the figure.
The incident angle θ for which the light ray grazes along the wall of the rod is
. It is surrounded by air. A light ray is incident at the midpoint of one end of the rod as shown in the figure. The incident angle θ for which the light ray grazes along the wall of the rod is
Options
A.sin-1
B.sin-1
C.sin-1
D.sin-1
Solution
SinC = 
...... (1)
Sin r = sin (90 - C) = cosC =
sin θ =
θ = sin-1
...... (1)Sin r = sin (90 - C) = cosC =
sin θ =
θ = sin-1
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