Question

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 $6000\stackrel{\circ }{A}$ and ${\mu }_{glass}=1.5$. The thickness of the film cannot be:

• A. $0.2\mu m$
• B. $1.0\mu m$
• C. $1.4\mu m$
• D. $1.6\mu m$

Answer 1

The correct option is B

$1.0\mu m$

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