Question

In a diffraction pattern, width of a fringe ____________.

Options

• does not depend on slit width

• varies directly as slit width

• varies inversely as slit width

• is directly proportional to the square of slit width

Answer 1

In a diffraction pattern, width of a fringe varies inversely as slit width.

Explanation:

`"For a diffraction pattern,"  "W" = (lambda"D")/"a"`

`therefore "W" prop 1/"a","where a is slit width."`