A beam of light consisting of two wavelengths 6500 \( \mathrm{P} \)...

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A beam of light consisting of two wavelengths 6500
\( \mathrm{P} \)
\( \AA \& 5200 \AA \) is used to obtain interference fringes in
W
a young's double slit experiment. The distance between the slits is \( 2.0 \mathrm{~mm} \) and the distance between the plane of the slits and the screen is 120 \( \mathrm{cm} \). What is the least distance from the central maximum where the bright fringes due to both the wave length coincide?
(1) \( 0.156 \mathrm{~cm} \)
(2) \( 0.152 \mathrm{~cm} \)
(3) 0.17
(4) \( 0.16 \mathrm{~cm} \).
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