Light of wavelength falls on two slits apart

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

Problem

Light of wavelength

550\,\text{nm}

falls on two slits

0.30\,\text{mm}

apart, the screen being

1.2\,\text{m}

away. A glass plate of thickness

1.65\,\mu\text{m}

and refractive index

1.5

is placed in front of one slit. By how much and in which direction does the central bright fringe shift on the screen? (a)

3.3\,\text{mm}

away from the slit with the glass plate (b)

2.2\,\text{mm}

towards the slit with the glass plate (c)

3.3\,\text{mm}

towards the slit with the glass plate (d)

1.6\,\text{mm}

away from the slit with the glass plate