Answer to Question #52354 in Optics for palashkumarmura

Question #52354

a double convex lens of focal length 20 cm is made of glass of refractive index 2/3.when placed completely in water(a M w) its focal length will be..
1) 80cm. 2) 15cm. 3) 17.7cm. 4) 22.5cm

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