In young’s double slit experiment with a source of light of wavelength `6320Å`, the first maxima will occur when

In Young's double slit experiment, while using a source of light of wavelength 4500 Å , the fringe width obtained is 0.4 cm. If the distance between the slits and the screen is reduced to half , calculate the new fringe width.

In Young's double slit experiment, if the source of light changes from orange to blue then :

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?

In a Young's double slit experiment if the slit separation is twice the wavelength of light used then the maximum number of interference maxima is