KVPY SB SX Exam 2011 Question Paper

Question : 96 of 120

Marks: +1, -0

A material is embedded between two glass plates. Refractive index n of the material varies with thickness as shown below. The maximum incident angle (in degrees) on the material for which beam will pass through the material is

60.0
53.1
43.5
32.3

Validate

Solution:

1.5 × \sin i = 1.2 \sin r

\sin r=1.5/1.2\sin i

T/R

should not take place
∴ sin r < 1

1.5/1.2\sin i < 1

\sin i < 12/15

sin i < 0.8

\sin 45° =1/√2 =0.707

i_\max > 45

Go to Question:

Prev Question

Next Question