A thin rod of 5 cm length is kept along the axis of a concave mirror of 10 cm focal length such that its image is real and magnified and one end touches the rod. Its magnification will be

Question

A thin rod of 5 cm length is kept along the axis of a concave mirror of 10 cm focal length such that its image is real and magnified and one end touches the rod. Its magnification will be, 1, 2, 3, 4

MARKS App · Accepted Answer

End A of the rod acts as an object for mirror and A ′ will be its image so u = 2 f – l = 20 – 5 = 15 cm ∵ 1 f = 1 v + 1 u ⇒ 1 - 10 = 1 v - 1 15 ⇒ v = - 30 cm . Now m = Length of image Length of object = ( 30 - 20 ) 5 = 2

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