The minimum distance of the point on the screen from central maxima where both the wavelengths will simultaneously produce a minima

300 μ m

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1080 μ m

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900 μ m

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Not possible to form minima together

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Solution

The correct option is C Not possible to form minima together
When there is a minimum we have path difference,
$δ x = [n - \frac{1}{2}] λ$
The minimum distance of the point on the screen from central maxima
where the wavelengths $600 n m$ and $720 n m$ will simultaneously produce a minimum is given by
$[n - \frac{1}{2}] 600$ = $[m - \frac{1}{2}] 720$
$⟹ n = \frac{12 m - 1}{10}$
Hence it is not possible to form a minima together.

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