Question

To form an image twice the size of the object of convex lens of focal length 20cm then distance of object must

Answer 1

Answer:

Hello

Explanation:

To form an image twice the size of the object of convex lens of focal length 20cm then distance of object must

Answer 2

Given f = 20 cm, h1 = 2h0

⇒h1/h0 = m = 2 ​    

∴v/u = 2 ⇒ v = 2u

 ∴1 ​/v − 1/u = 1/f (lens formula)

⇒1/2u − 1/-u  = 1/20

⇒1+2/2u = 1/20

⇒ u = 30 cm

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