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An object placed between the pole and focus of a concave mirror produced a virtual and enlarged image. Explain this using mirror formula. |
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Answer» Solution :According to the spherical mirror FORMULA `(1)/(v)+(1)/(U)=(1)/(f)` `(1)/(v)=(1)/(f)-(1)/(u)` `(1)/(v)=(u-f)/(uf)` For a CONCAVE mirror, f = - ve and u = - ve, It is given that `u lt f` so v is positive. Since `v gt 0` i.e. positive and `u lt 0` i.e. negative. Therefore, image FORMED is BEHIND the mirror [virtual]. `m=-(v)/(u)` `m=-((+v))/((-u))` therefore m is + ve and the image is enlarged. |
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