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An object is placed in front of a concave mirror 20 cm away from it. If its focal length is 40 cm, locate the position of image and its nature. |
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Answer» f = – 40 cm, u = – 20 cm f = \(\cfrac{uv}{u+v}\) – 40 = \(\cfrac{-20}{-20+u}\) – 40 ( – 20 + v ) = – 20 v – 20 + v = -20/-40 = v/2 \(\therefore\) - v/2 = -20 Features of image: At behind the mirror, very large, virtual, direct. |
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