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Standard XII

Physics

Wave Equation

Assertion :If...

Question

Assertion :If light enters from medium-1 into medium-2 and bends towards the normal, its wavelength in medium-2 is smaller than its wavelength in medium-1 Reason: According to Cauchy's relation, $μ = A + \frac{B}{λ^{2}}$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$n = \frac{c}{v} = \frac{λ_{0}}{λ}$
n increase $λ$ decrease
Reason : Cauchy's relation is for same medium and different wave length.
Assertion : Snell's law for same wavelength is different medium.

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Assertion :If light enters from medium-1 into medium-2 and bends towards the normal, its wavelength in medium-2 is smaller than its wavelength in medium-1 Reason: According to Cauchy's relation, μ=A+Bλ2

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertionn=cv=λ0λn increase λ decreaseReason : Cauchy's relation is for same medium and different wave length.Assertion : Snell's law for same wavelength is different medium.

Assertion :If light enters from medium-1 into medium-2 and bends towards the normal, its wavelength in medium-2 is smaller than its wavelength in medium-1 Reason: According to Cauchy's relation, $μ = A + \frac{B}{λ^{2}}$