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In young’s double slit experiment the are illuminated by monochromatic light. The entire setup is immersed in pure water. Which of following cannot restore the original fringe width? 

Option: 1

Bringing the silts closer together


Option: 2

Moving the screen away from the silt plane


Option: 3

Replacing the incident light by that of longer wavelength


Option: 4

Introducing a thin transparent slab in front of one of the silt


Answers (1)

best_answer

As we learn

Fringe Width in a medium -

{\beta }'= \frac{\beta }{\mu }

- wherein

Since wavelength in a medium become \lambda = \frac{\lambda _{o}}{\mu }

 

 \beta _{w}=\frac{\beta }{\mu }=\frac{\lambda _{0}D}{\mu d}

\beta decreses to restore the fringe width we have to increse the value of  \beta. Introducing a slab in front of any silt as not change the balue of \beta but it only shift the whole pattern.

 

Posted by

vishal kumar

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