A beam of light consisting of two wavelengths and is used to obtain interference…

PHYSICS · Single correct · CBSE · Physics · Wave Optics · Wave Optics

Problem

A beam of light consisting of two wavelengths

6500\,\text{\AA}

and

5200\,\text{\AA}

is used to obtain interference fringes in YDSE. The distance between the slits is

2\,\text{mm}

and the distance of the screen from the slits is

120\,\text{cm}

. What is the least distance from the central maximum where the bright fringes due to both wavelengths coincide? (1)

0.156\,\text{cm}

(2)

0.312\,\text{cm}

(3)

0.078\,\text{cm}

(4)

0.468\,\text{cm}