A wedge of angle `0.5^(@)` is illuminated with sodium light whose two lines corresponds to the wavelengths `5890Å` and `5896Å`. Find the distance from the apex at which the maxima due to the two wavelengths first coincide when observed in the reflected light. (the wedge contains air)

A beam of light consisting of wavelengths 6000 Å and 4500 Å is used in a YDSE with D = 1 m and d = 1 mm. Find the least distance from the central maxima, where bright fringes due to the two wavelengths coincide.

A beam of light consisting of wavelengths 6000 Å and 4500 Å is used in a YDSE with D = 1 m and d = 1 mm. Find the least distance from the central maxima, where bright fringes due to the two wavelengths coincide.

A beam of light consisting of two wavelength, 6500 Å and 5200 Å is used to obtain interference fringes in a Young's double slit experiment. Find the distance of the third fringe on the screen from the central maximum for the wavelength 6500Å . What is the least distance from the central maximum at whixh the bright fringes due to both wavelengths coincide? The distance between the slits is 2 mm and the distance between the plane of the slits and the screen is 120 cm.

Two sources of light of wavelength 4500 Å annd 6000 Å are used simultaneously in Young's double slit experiment. At which order of the two wavelength pattern,s the fringes coincide?