Question

In diffraction experiment, from a single slit, the angular width of the central maxima does not depend upon ____________.

Options

• ratio of wavelength and slit width

• distance of the slit from the screen

• wavelength of light used

• width of the slit

Answer 1

In a diffraction experiment, from a single slit, the angular width of the central maxima does not depend upon the distance of the slit from the screen.

Explanation:

In diffraction from a single slit, the angular width of central maxima,

θ = `(2λ)/"a"`

where λ = wavelength of light used,

and a = width of the slit

∴ The angular breadth is independent of the slit's distance from the screen.

OR

Linear width of central maximum = `(2lambdaD)/d`

∴ The angular width of central maximum = `(2lambda)/d`