\( M_{1} \) and \( M_{2} \) are two plane mirrors which are kept parallel to each other as shown...

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\( M_{1} \) and \( M_{2} \) are two plane mirrors which are kept parallel to each other as shown. There is a point \( O \) on perpendicular screen just in front of \( S \) . What should be the wavelength of light coming from monchromatic source \( S \) . So that a maxima is formed at \( O \) due to interference of reflected light from both the mirrors. [Consider only 1st reflection] \( [Dd, d\lambda] \)
(a) \( \frac{3 d^{2}}{D} \)
(b) \( \frac{3 d^{2}}{2 D} \)
(c) \( \frac{d^{2}}{D} \)
(d) \( \frac{2 d^{2}}{D} \)
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