[" 42.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 "],[" the camera) is the sum of its geometrical "],[" spread and the spread due to diffraction."]

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 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.

A diffraction-limited laser of length l and aperture diameter d generates light of wavelength lambda . If the beam is directed at the surface of the Moon a distance D away, the radius of the illuminated area on the Moon is approximately

A beam of parallel light rays is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the diagram below: Which of the following could be inside the box?

A glass sphere with 10 cm radius has a 5 cm radius spherical hole at its centre. A narraow beam of parallel light is directed into the sphere. Where, if anywhere, will the sphere produce an image? The index of refraction of the glass is 1.50.