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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions
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© examsnet.com
Question : 75
Total: 99
A beam of light consisting of red, green and blue colours is incident on a right-angled prism on face AB. The refractive indices of the material for the above red, green and blue colours are 1.39, 1.44 and 1.47 respectively. A person looking on surface AC of the prism will see
[Online May 26, 2012]
no light
green and blue colours
red and green colours
red colour only
Validate
Solution:
For light to come out through face 'AC', total internal reflection must not take place.
i.e.,
θ
<
c
⇒
sin
θ
<
sin
c
⇒
sin
θ
<
1
µ
or
µ
<
1
sin
θ
⇒
µ
<
1
sin
45
°
⇒
µ
<
√
2
⇒
µ
<
1.414
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