Diffraction Patterns In parts 1 and 2 of the lab, you looked at and ranked the s

Question

Diffraction Patterns

In parts 1 and 2 of the lab, you looked at and ranked the single-slit slit widths and the double-slit slit widths and slit spacings. In the figures below, intensity graphs from a similar set of slits are shown in a random order. Match each pattern with its slit specification. These graphs are based on a screen to slit distance of 1.00 m and a laser wavelength of 633 nm.

Options are

Single slit a=0.04mm
Single slit a=0.08mm
Single slit a=0.16mm
Double slit a=0.04mm, d=0.125mm
Double slit a=0.04mm, d=0.250mm
Double slit a=0.08mm, d=0.250mm

Explanation / Answer

the graph shown is for single slit.The diffraction pattern due to single slit consists of a central bright maximum at O alongwith secondary minima and maxima on either side.

width of central maximum = 2*D*l/a

D = distance between slit and screen, a = slit width, l = wavelength

width of central maxima = 2*1*633*10-9 / 0.16*10-3

                 = 0.8 cm

from graph width of central maxima is also 0.8 cm.

so its specification is , single slit a= 0.16mm

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