formation of newtons ring by reflection of monochromatic light
Answers
Explanation:
If monochromatic light is allowed to fall normally on the lens, and the film is viewed in reflected light, alternate bright and dark concentric rings are seen around the point of contact. These rings were first discovered by Sir Isaac Newton, hence named as Newton's Rings .
Answer:
If monochromatic light is allowed to fall normally on the lens, and the film is viewed in reflected light, alternate bright and dark concentric rings are seen around the point of contact. These rings were first discovered by Sir Isaac Newton, hence named as Newton's Rings.
The interference pattern can be observed clearly when monochromatic light is used. When white light is used the interference pattern will not be very clear because different wavelengths of light interfere at a different thickness.
Newton's rings are formed as a result of interference between the light waves reflected from the top and bottom surfaces of the air film formed between the lens and glass sheet. ... When a ray is incident on the surface of the lens, it is reflected as well as refracted.
To determine the wavelength of sodium light by Newton's ring. ... Formula used : The wavelength λ of light is given by the formula: Where, Dn+m = diameter of (n+m)th ring, Dn = diameter of nth ring, m = an integer number (of the rings) R = radius of curvature of the curved face of the plano-convex lens.