1 Physics -- Interference

When a glass plate is used to cover both slits in Young's Double Slit experiment, what happens to the fringe pattern?

1 Answers

If a glass plate is used to cover both the slits in Young's Double Slit Experiment, the speed of light passing through the slit decreases. And, we know λ = v / f. Since the frequency of light remains constant, the wavelength decreases with the decrease in the velocity of sound.
We also know that the fringe width is given by

β = λD/d
where,
D= distance between slit and screen
d= slit width

Since D and d remain constant in the above relation, fringe width is directly proportional to the wavelength of light. So, along with the decrease in wavelength of light, the fringe width decrease.

Hence, if a glass plate is used to cover both the slits in YDSE, the fringe width decreases.

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