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
1
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2015-05-29T11:50:26-0400
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