A point source is located at a distance of 20 cm from the front surface of a symmetrical glass biconvex lens with equal radii of curvature 5 cm . The distance at which image formed from the rear surface of this lens is [Given refractive index of the glass is 1 . 5 ]

Question

A point source is located at a distance of 20 cm from the front surface of a symmetrical glass biconvex lens with equal radii of curvature 5 cm . The distance at which image formed from the rear surface of this lens is [Given refractive index of the glass is 1 . 5 ], 20 3 cm, 10 3 cm, 5 cm, 10 cm

MARKS App · Accepted Answer

From lens makers formula for biconvex lens, we have 1 f = μ - 1 2 R ⇒ 1 f = 1 . 5 - 1 2 5 = 1 5 From Lens equation, we have 1 v - 1 u = 1 f ⇒ 1 v - 1 - 20 = 1 5 ⇒ 1 v = 1 5 - 1 20 = 3 20 ⇒ v = 20 3 cm

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