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Assertion (A): The film which appears bright in reflected system will appear dark in the transmitted system and vice-versa
Reason (R): The conditions for film to appear bright or dark in the reflected light are just reverse to those in the transmitted light

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A is true and (R) is true and (R) is the correct explanation of (A)

A and R are true but R is not the correct explanation of A

A is true , R is false

A is false, R is true

answer is A.

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Detailed Solution

For a reflected system of thin film, the condition for maxima is $2 μ t \cos r = (2 n - 1) \frac{λ}{2} .$ While the maxima for a transmitted system of film is $2 μ t \cos r = n λ$ and is reverse for minima.

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