A beam of light contains two wavelengths 6500Å and 5200Å. They form interference fringes in Young’s double slit experiment. What is the least distance (approx) from central maximum, where the bright fringes due to both wavelength coincide? The distance between the slits is 2 mm and the distance of screen is 120 cm.

Options

(a) 0.16 cm
(b) 0.32 cm
(c) 0.48 cm
(d) 1.92 cm

Correct Answer:

0.16 cm

Explanation:

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