The box of a pin hole camera, of length L, has a hole of radius a . It is assumed that when the hole is illuminated by a parallel beam of light of wavelength `lamda` the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say b_(min)) when:

The box of a pin hole camera of length L has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength lambda the speed of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say b_("min")) when .....

The box of a pin hole camera of length L, has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength lambda , the spread of the spot (obtained on the opposite wall of camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would have its minimum size (say b_(min) ) when.

For an aperture of size a illuminated by a parallel beam of light having wavelength 1, the Fresnel distance is:

For an aperture of size a illuminated by a parallel beam of light having wavelength 1, the Fresnel distance is:

In a pin-hole camera, we usually get

What should be the slit width to obtain pronounced diffraction with a single slit illuminated by light of wavelength lamda ?

A metal disc has a hole in it. Does the size of hole change when the disc is heated ?