State and explain Huygens principles. Name the type of wave front that corresponds to a beam of light. (i) coming from a convex lens when point sources is placed its focus, (ii) coming from very far off source, (iii) diverging redially from a point source.
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What is the shape of wavefront for the light diverging from a point source ?
What is the shape of the wavefront in each of the following cases ? (a) light diverging from point source. (b) light emerging out of a convex lens when a point source is placed at its focus. ( c) the portion of the wavefront of light from a distant star intercepted by earth.
IF A is the amplitude of the wave coming from a point source at distance r then
