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In a Young's double slit experiment, sli...

In a Young's double slit experiment, slits are separated by `0.5 mm` and the screen is placed `150 cm` away. A beam of light consisting of two wavelengths, `650 nm` and `520 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

A

15.6 mm

B

1.56 mm

C

7.8 mm

D

9.75 mm

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The correct Answer is:
C
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