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An object placed 20 centimetres in front of the convex mirror is found to have an image15 centimetres behind the mirror. Find the focal length of the mirror╥﹏╥╥﹏╥╥﹏╥╥﹏╥╥﹏╥ |
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Answer» Answer: We know that 1/v + 1/u = 1/F ⇒ 1/-15 + 1/-20 = 1/f ⇒ 1/f = - (1/15) – 1/20 = (-4 – 3)/60 = - (7/60) ∴ f = - (60/7) cm The mirror is a concave mirror. (b) u = -20cm, v = 15cm We know that 1/v + 1/u = 1/f ⇒ 1/15 + 1/-20 = 1/f Explanation: please MARK brainliest |
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