Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm.

A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young experiment.- Find the distance of the third bright fringe on the screen from the central maximum for wavelength 650 nm.

In a Young's double slit experiment ,the fringes are formed at a distance of 1 m from double silt of separation 0.12 mm.Calculate the distance of 3rd dark b and from the centre of the screen. consider wavelength equal to 6000 A^@

Two point white dots are 1 mm apart on a black paper.They are viewed y eye of pupil diameter 3 mm.Approximately,what is the maximum distance at which these dots can be resolved by the eye? Take wave length of light =500 nm

In Young.sexperiment, two slits ae made 1 mm (milimeter) apart and screen is placed 1 meter away. What is the fring separation when blue green light of wavelength 500 nm (nanometer) is used.

A beam of ligth consisting of two wavelength 4,800 overset@A and 6,000 overset@A is used to obtain interfernce fringes in a double slit experiment.The distnce between the slits is 1.8 mm and the distance of screen from the plane of slits is 1.2 m Find the distance of the third bright frings on the screen from the central maximum for the wavelength 6,000 overset @A .

Light of wavelength 600 nm is incident on an aperture of size 2 mm.Calculate the distance upto which the ray of light can travel,such that its spread is less than the size of the aperture.

A beam of light consisting of two wavelengths, 650 nm and 520 nm,is used to obtain interference fringes in a Young experiment.-What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide?