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Standard XII
Physics
TIR
Question
The colour which has least critical angle is
Orange
Violet
Red
Green
A
Red
B
Green
C
Orange
D
Violet
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Solution
Verified by Toppr
For total internal reflection to take place.
μ
sin
θ
c
=
1
θ
c
=
sin
−
1
(
1
μ
)
As a fact, the refractive index for a ray is inversely
proportional to its wavelength.
μ
×
1
λ
Since violet has shortest wavelength it's critical
angle is also low
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