Page 29 - WAVES

Diffraction of Light

a) Single Slit b) Pin hole

alternate

bright bands and dark bright and
bands of different width. dark ring

Screen Light spread after
passing the pin

hole
Light

spreads
out behind
the slit

Laser beam

1. Light is diffracted if it passes through a

narrow slit comparable in size to its
0.1mm
wide slit wavelength.
2. However, the effect is not obvious as the

size of the slit increases.
3. This is because the wavelengths of light are
Laser beam
very short.

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