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An object 3cm high is placed at a distance of 8cm from a concave mirror which produces a virtual image 4.5cm high. Find the focal length of the mirrorAnswer is 24 cmHow |
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Answer» Answer: MARK as brainliest and follow me please Explanation: Height of the object (H) = 3 cm Distance of object from concave mirror (U) = -8 cm Height of the virtual image formed (h') = 4.5 Let's find 'v' first = - v/u = h'/h v = - u × h'/h v = - ( -8) × 4.5 / 3 v = 12 cm ________ (i) Focal length of mirror = ? 1/f = 1/v + 1/u 1/f = 1/12 + 1/ -8 1/f = -1/24 1 × 24 = -f 24 = -f f = -24 cm
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