Question

in Newton rings experiment if plane glass plate is replaced by a plane mirror then we shall get-dark fringes only, uniform illumination, bright fringes only, both bright and dark fringes

Answer 1

Alternate dark and bright rings formed due to the presence of air film when the plano-convex lens is placed on the glass plate is called newtons rings.
They are formed as a result of Interference between light wave reflected from upper and lower surfaces of the air films developed between the convex surface of a plano-convex lens and the plane glass plate.
 If we replace the glass plate with a mirror then, we will not get any interference fringe because the intensity of light reflected from the mirror will be so great that it won't be visible and we will get uniform illumination.If we do this, then the interference will take place but the shape of the rings will be irregular.

Answer 2

Answer:

The circular interfering pattern that Newton first identified as Newton rings. A wedge-shaped air film (with a gradually rising thickness) forms among a plano-convex lens and a planar plate when the lens is positioned with its circular cylinder facing the glass plate. The air film's depth is zero at the point of contact and progressively rises as it moves away from it. When homogeneous light from a sources "S" is allowed to fall naturally onto the lens, two reflected rays R1 from the upper film surface and R2 from the lower surface of the air film clash to create a circular diffraction patterns. Around the point of contact, this interference pattern has concentric rings that alternate between brightness and darkness.

Explanation:

Home Consistent Light. A measurement of the evenness and uniformity of the distribution of light in a space is known as light uniformity, also known as lighting evenness. Amount of light and dark patches in the area to be lit is also described, as is the cleanliness of the lighting pattern.

Bright fringe refers to the disruption that occurs when the crests of two waves cross at the same time. The dark fringe results from the same thing, which occurs when the dip of one wave coincides with the trough of another wave.

The fringe width is the distance between two adjacent bright (or dark) fringes. The Young's dual slit experimental equipment will experience a "times reduction in fringe width & wavelength if submerged in a liquid with a refractive index.

#SPJ2