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an object is placed 18cm from a spherical mirror.if the image is formed at 4cm,what is the nature of image |
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Answer» U = - 18 cm v = 4 cm 1 / f = 1 / v + 1 / u 1 / f = 1 / 4 + 1 / (- 18) 1 / f = 1 / 4 - 1 / 1 8 1 / f = 9 - 2 / 36 = 7 / 36 f = 36 / 7 cm focal length is positive so mirror is convex. R = 2 × 36 / 7 = 72 / 7 cm |
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