Question

What happens to fringe width in Young's double slit experiment if it is performed in glycerine instead of air.

• A. Shrinks
• B. Disappears
• C. Unchanged
• D. Enlarged

Answer 1

Answer: (A)

Shrinks

$\beta =\frac{D\lambda }{d}$
if it Be performed in glycerine then
${\lambda }^{\prime }=\lambda /\mu$
${\beta }^{\prime }=\frac{D\lambda }{\mu d}$ Since $\mu >1$
So, ${\beta }^{\prime }<\beta$ (shrinks)