Multi slit interference

What is the effect of increasing the number of slits on a double interference pattern?

• principal maxima become more sharper

• intensity of the pattern increases

• Bright fringes remain in the same positions

• distance between two concecutive maxima increases

Increasing the number of slits in multislit interference

• increases the intensity of the secondary maxima

• none of these

• perforates the slit further leading to a loss of intensity

• reduces the intensity of the secondary maxima

A diffraction grating

• is made up of a large number of equaly spaced parallel slits

• is used in single slit diffraction

• typically has 10000 lines per cm

• is necessary for refraction of light

White light diffraction is

• reflected light

• sometimes called white light dispersion

• refracted light condominium

• involves use of monochromatic light

Name two applications of the diffraction grating

• Decoding information from the now obsolete CDs

• Mass spectroscopy

• Laser beam focussing

• Light spectroscopy

The double slit interference pattern depends on the following factors

• separation between the two slits

• distance between the plane of the slits and the screen

• width of each slit

• Distance between interference maxima

Single slit modulation of an intereference pattern happens when

• the slits are of finite width

• slits are infinitely narrow

• the slit width is negligibly small

• none of these