In YDSE setup slits are illuminated by a light of wavelength `4000Å` and a light of unknown wavelength. It is observed that fourth dark fringe of known wavelength coincide with second bright fringe of unknown wavelength. Find the unknown wavelength.

In a double-slit experiment, two parallel slits are illuminated first bylight of wavelength 400 nm and then by light of unknown wavelength. The fourth-order dark fringe resulting from the known wavelength of light falls in the same place on the screen as the second-order bright fringe from the unknown wavelength. The value of unknown wavelength of light is

In YDSE, two slits are illuminated by two light sources of same wavelength. Will you observe interference pattern ?

A micture of light, consisting of wavelength 590nm and an unknown wavelength, illuminates Young's double slit and gives rise to two overlapping interference patterns on the scree. The central maximum of both lights coincide. Further, it is obseved that the third bright fringe of known light coincides with the 4th bright fringe of the unknown light. From this data, the wavelength of the unknown light is:

The biprism experiment is performed by using first the blue light of wavelength 4800 Å and then with red light. It is found that the fourth bright band of blue light coincides with the third bright band of red light. What is the wavelength of red light?

Then nth bright band of red light of wavelength 6750Å is coincide with (n+1)^(th) bright band of green light of wavelength 5400Å . Find the value of n .

Two slits, 4 mm apart, are illuminated by light of wavelength 6000 Å . What will be the fringe width on a screen placed 2 m from the slits

Two parallel slits 0.6mm apart are illuminated by light source of wavelength 6000Å . The distance between two consecutive dark fringe on a screen 1m away from the slits is

In a YDSE setup interference fringes are obtained by sodium light of wavelength 5890Å . On screen the fringes have an angular width 0.20^(@) . Now the wavelength of light is changed and it is found that fringe width increases by 10%, the new wavelength of incident light is :