Question

In the biprism experiment, a source of monochromatic light is used for a certain distance between slit and eyepiece. When the distance between two virtual sources is changed from d_A to d_B, then the fringe width is changed from Z_A to Z_B. The ratio Z_A to Z_B is ______

विकल्प

• `sqrt(d_B/d_A)`

• `(d_A/d_B)`

• `(d_B/d_A)`

• `(d_A/d_B)^2`

Answer 1

In the biprism experiment, a source of monochromatic light is used for a certain distance between slit and eyepiece. When the distance between two virtual sources is changed from d_A to d_B, then the fringe width is changed from Z_A to Z_B. The ratio Z_A to Z_B is `underline((d_B/d_A))`.

Explanation:

Fringe width is given by z = `(lambdaD)/d`

∴ `Z_A/Z_B = d_B/d_A`