Physics

Problem

In a Young's double slit experiment, slits are separated by

0.5 \text{ mm}

, and the screen is placed

150 \text{ cm}

away. A beam of light consisting of two wavelengths,

650 \text{ nm}

and

520 \text{ nm}

, is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide is : [JEE(Main) 2017] (1)

7.8 \text{ mm}

(2)

9.75 \text{ mm}

(3)

15.6 \text{ mm}

(4)

1.56 \text{ mm}

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