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Standard XII
Physics
Question
Find the value of
∠
r
for the case shown in figure
sin
−
1
(
0.5
)
75
∘
−
sin
−
1
(
0.5
)
90
∘
60
∘
A
sin
−
1
(
0.5
)
B
75
∘
−
sin
−
1
(
0.5
)
C
90
∘
D
60
∘
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Solution
Verified by Toppr
∠
i
=
45
0
;
∠
r
=
?
μ
=
s
i
n
i
s
i
n
r
s
i
n
r
=
s
i
n
i
μ
=
0.707
√
2
=
0.5
r
=
s
i
n
−
1
(
0.5
)
Hence, option A is correct.
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