Light from two coherent sources is reaching the screen. If the path difference at a point on the screen for the yellow light be `(3lambda)/2`, then what will be the colour of the fringe at that point?

What is the difference between coherent and incoherent sources of light?

What are coherent sources of light? Why no interference pattern is observed when two coherent sources are very for apart?

For light diverging from a point source.

A ocnverging bem of light forms of a sharp image on a screen. lens is placed in the path of the beam at 10 cm from the screen.It si found that screen has to be moved 8 cm further away from the lens to obtain a sharp image.Find the focal length and natrue of the lens.

In Young wavelength lambda , the intensity of light at a point on the screen where path difference is lambda , is K units. What is the intensity of light at a point where path difference is lambda/3 ?

In a double slit experiment the distance between the slits is 3 mm and the slits are 2 m away from the screen. Two interference patterns can be seen on the screen one due to light with wavelength 480 nm, and the other due to light with wavelength 600 nm. what is the separation on the screen between the fifth order bright frings of the two interference patterns?

In a double-slit experiment the angular width of a fringe is found to be 0.2^@ on a screen placed 1 m away. The wavelength of light used is 600 nm. What will be the angular width of the fringe if the entire apparatus is immersed in water? Take refractive indexof water to be 4/3 .

Two nearby narrow slits are illuminated by a single monochromatic source. Name the pattern obtained on the screen. One of the slits is now covered. What is the name of the pattern now obtained on the screen? Write two differences between the pattens obtained in the two cases.

If amplitudes of two lights from coherent sources in Young.s double slit experiment are in the ratio 2:5, then finf the ratio of intensity at the maxima to the intensity at minima in interference pattern.