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The size of the image, if an object of 2.5 m height is placed at a distance of 10 cm from a concave mirror is:(Take radius of curvature of concave mirror = 30 cm) |
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Answer» Height of object = h = +2.5 m = 250 cm Object distance = U = -10cm R = -30 cm Focal LENGTH = R/2 = -15 cm Image distance = v = ? Height of image = h' = ? APPLYING MIRROR formula, 1/f = 1/v + 1/u 1/v = 1/f - 1/u =-1/15 + 1/10 = -2+3/30 =-1/30 v = -30 cm We know that , MAGNIFICATION = m m = -v/u = -(-30)/-10 = -3 Also, m = h'/h -3 = h'/250 h' = -750 cm Size of the image = h' = 750 cm The image is 750 cm or 7.5 metres high |
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