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a. Two lenses have power of (i) +2d (ii) -4D. What is the nature and focal length of each lens? b. An object is kept at a distance of 100 cm from lens of power -4D. Calculate the image distance. |
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Answer» Solution :a. (i) CONVEX lens =+50 CM (ii) CONCAVE lens =25 cm b. `1/f=1/v-1/u` `f=1/(-4D)=-25cm` `u=-100cm` `1/v=1/f+1/u` `=-1/25-1/100` `=(-5)/100=-1/20` `v=-20cm` |
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