For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength 500 nm?

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

A beam of light consisting of two wavelegnths, 6,500 overset @A and 5,200 overset @A is used to obtain interference fringes in a Young's double slit experiment. The distance between the slits is 2 mm and the screen is 120 cm. What is the least distance from the central maximum, when the bright fringes due to both the wavelengths coincide?

An astonaut is lookin down on earth's surface from a space shuttle at an altitude of 400 km.Assuming that the astronaut's pupil diamter is 5 mm and the wavelength of visible ight is 500 nm,The astonaurt will be able to resolve linear objects of the size of about:

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

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 What is the lest distance from the centre of the screen,where the brigth fringes due to both the wvelength coincide?