Calculate Fresnel distance for aperture of 1mm using Red light of wavelength 7000Å.

What is the Fresnel distance for an aperture of 3 mm and wavelength 400 nm?

A microscope is used to resolved two objects placed at a distance of 2 xx 10^(-4) cm . Calculate the numerical aperture of the microscope if light of wavelength 6,000 Å is used.

A slit of aperture 1.8 mm is illuminated by light of wavelength 5,000 Å . Calculate the minimum distance light can travel before the diffraction is noticed.

A binary star system is observed using a telescope. The angular separation between both the stars is 5 xx 10^(-6) radians. Calculate the aperture of objective of the telescope if light of wavelength 5,500 Å is used.

How much a beam would diffract when it travels a distance of 5 m, after crossing an aperture of 3mm having wavelength 3000 Å ?

How much a beam would diffract when it travels a distance of 5 m, after crossing an aperture of 3mm having wavelength 3000 Å ?