Problem

In YDSE, both slits produce equal intensities on the screen. A 100% transparent thin film is placed in front of one of the slits. Now, the intensity on the centre becomes 75% of the previous intensity. The wavelength of light is

6000 \text{ \AA}

and refractive index of glass is 1.5. The minimum thickness of the glass slab is a.

0.2 \mu\text{m}

0.3 \mu\text{m}

0.4 \mu\text{m}

0.5 \mu\text{m}

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