InterviewSolution
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prove that v=-u in plane mirror by mirror formula |
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Answer» For plane mirror the usual mirror formula can be used usual mirror formula involves object distanceu image distancevand f-the focal length which is equal toR/2whereRis the radius of curvature. the form of equation is 1/u + 1/v = 1/f = 2/R the question is what is radius of curvature of a plane mirror? if one takes the radius of curvature R to be very large compared to u and v then the curved surfaces will be planes. so ifR is infinitely large then 2/R goes to zero. so the plane mirror formula reduces to 1/u + 1/v =0 meansu = -v so if object is placed in front of mirror , the image will be located behind the mirror. however as the formula is trivial so its not used. but when several media gets coupled to plane mirror this concept is used . |
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