Problem

In a 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 of the geometrical centre of system on the screen becomes 75 % of the previous intensity. The wavelength of the light is

6000 \text{ \AA}

and

\mu_{\text{glass}} = 1.5

. The thickness of the film cannot be: (a)

0.2 \mu\text{m}

(b)

1.0 \mu\text{m}

(c)

1.4 \mu\text{m}

(d)

1.6 \mu\text{m}

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