Question

The graph shows the variation of fringe width (β) versus distance of the screen from the plane of the slits (D) in Young's double-slit experiment Keeping other parameters the same. The wavelength of light used can be calculated as d = distance between the slits ______ 

 

Options

• the slope of graph × d

• slope of graph/d

• the slope of graph × d²

• d/slope of graph

Answer 1

The graph shows the variation of fringe width (β) versus distance of the screen from the plane of the slits (D) in Young's double-slit experiment Keeping other parameters the same. The wavelength of light used can be calculated as d = distance between the slits the slope of graph × d.

Explanation:

`beta = (lambdaD)/d`

slope = `beta/D = lambda/d`

∴ λ = slope × d