Question

A graph is plotted between the fringe-width Z and the distance D between the slit and eye-piece, keeping other adjustment same. The correct graph is

A.	B.
C.	D.

Options

• A

• B

• D

• C

Answer 1

C

Explanation:

The fringe width is given by

Z = `("D"lambda)/"d"`

As, λ and d are constants.

∴ Z ∝ D

So, the graph between Z and D will be a straight line inclined to 0-axis, as shown in graph (C).