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KVPY 2020-21 SB SX Exam Previous Papers
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© examsnet.com
Question : 34
Total: 120
A monochromatic beam of light is incident at the interface of two materials of refracive index
n
1
and
n
2
as shown. If
n
1
>
n
2
and
θ
c
is the critical angle then which of the following statements is NOT true?
θ
1
=
θ
3
for all values of
θ
1
.
cos
θ
2
is imaginary for
θ
1
>
θ
c
cos
θ
2
=
0
for
θ
1
=
θ
c
.
cos
θ
3
is imaginary for
θ
1
=
θ
c
.
Validate
Solution:
n
1
>
n
2
this means light is going from rarer to denser medium.
So
θ
2
will always be less than
θ
1
n
2
sin
θ
1
=
n
1
sin
θ
2
So
cos
(
θ
2
)
will never be imaginary and also
θ
2
can't be
90
°
. In question incorrect options are asked.
∴
(
B
,
C
,
D
)
© examsnet.com
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