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UPSEE 2019 Solved Paper
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© examsnet.com
Question : 39
Total: 150
Two beams of red and violet colour are made to pass separately through a prism with angle of prism
60
°
. In the position of minimum deviation, the angle of refraction will be
60
°
for both colours
30
°
for both colours
greater for violet colour
greater for red colour
Validate
Solution:
As, we know, from Cauchy's formula,
Wavelength
∝
1
µ
Since,
λ
voilet
<
λ
red
Hence from the above equation,
µ
violet
>
µ
red
For a prism,
µ
=
sin
i
sin
r
As, it is given that angle of incidence is same for both the beams
So,
sin
r
∝
1
µ
∵
µ
violet
>
µ
red
∴
sin
r
violet
<
sin
r
red
∠
r
violet
<
∠
r
red
Hence, the angle of refraction will be greater for red colour.
© examsnet.com
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