FRESNEL'S BIPRISM

Billet's lens||Fresnel Biprism

If the refracting angle of a Fresnel Biprism is increased, then

In Fresnel's biprism (mu=1.5) experiment the distance between source and biprism is 0.3m and that between biprism and screen is 0.7m and angle of prism is 1^@ . The fringe width with light of wavelength 6000Å will be

A Fresnel's biprism arrangement is set with sodium light ( lambda = 5893 Å ) and in the field of the eyepiece we get 62 fringes. How many fringes shall we get if we replace the source by mercury lamp using , (a) green filter (lambda=5461 " "A^(@)) (b) violet filter (lambda = 4358 A^(@))

Interference fringers are produced by a Fresnel's biprism in the focal plane of reading microscope which is 100 cm from the slit. A lens interposed between the biprism and the microscope gives two images of the slit in two positions.If the images of the slits are 4.05 mm apart in one case, 2.90 mmin the other and the wavelength of light used is 5893 Å, find the distance between two consecutive bands.

Two small angled transparent prisms (each or refracting angle A = 1^(@)) are so placed that their bases coincide, so that common base is BC. This device is called Fresnel's biprism and is used to obtain coherent sources of a point source S illuminated by monochromatic light of wavelength 6000 Å placed at a distance a = 20 cm. Calculate the separation between coherent sources. If a screen is placed at a distance b = 80 cm. from the device, what ist the finge which of fringes obtained (Refractive index of material of each prism = 1.5.)

What is Fresnel's distance ?