With respect to air critical angle in a medium for light of red colour [λ1] is θ. Other facts remaining same, critical angle for light of yellow colour [λ2] will be
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a
θ
b
More than θ
c
Less than θ
d
θλ1λ2
answer is C.
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Detailed Solution
Critical angle =sin−11μ ∴θ=sin−11μλ1 and θ′=sin−11μλ2 Since μλ2>μλ1, hence θ′<θ
With respect to air critical angle in a medium for light of red colour [λ1] is θ. Other facts remaining same, critical angle for light of yellow colour [λ2] will be