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A ray of light passing through the optical center of the lens travels straight without suffering any deviation. This holds good only in the case of a thin len..

Formation of Image by a Convex Lens - When an object is placed in front of a lens, light rays coming from the object fall on the lens and get refracted. The refracted rays produce an image at a point where they intersect or appear to intersect each other. The formation of images by lenses is usuall..

Kirchhoff's Law - A body that is a good radiator (or emitter) is also a good absorber. To understand this, suppose isotropic (i.e., equal in all directions) thermal radiation is incident on a body. Let a be the fraction of the total thermal radiation of all wavelengths absorbed ..

When an object is placed in front of a lens, light rays coming from the object fall on the lens and get refracted. The refracted rays produce an image at a point where they intersect or appear to intersect each other. The formation of images by lenses is usually shown by a ray diagram. To construc..

1. During constructive interference R m a x = A + B as cos f = + 1 During destructive inference cos f = -1 R m i n = A - B special case If A =B (i.e., if the two waves have same amplitude) then This indicates a good contrast between the bright and dark bands, which is..