Q#2 An ant is in front of a vertical convex lens.The antssharp image appears 26.

Question

Q#2 An ant is in front of a vertical convex lens.The antssharp image appears 26.0cm behind the lens (3 sign  fig).The ant is 4 times as large as its image. The focal lenght ofthe lens is (     ) cm (a) 0 (b) 3.9 (c)7.4 (d)12.8 (e) 15.9 (a,b) 17.5 (a,c)20.8 (a,d) 30.9 Q#2 An ant is in front of a vertical convex lens.The antssharp image appears 26.0cm behind the lens (3 sign  fig).The ant is 4 times as large as its image. The focal lenght ofthe lens is (     ) cm (a) 0 (b) 3.9 (c)7.4 (d)12.8 (e) 15.9 (a,b) 17.5 (a,c)20.8 (a,d) 30.9

Explanation / Answer

here we have image size = 26 cm now ant is 4 times more than image size so we have object size u = 4 x 26 cm                                          = 104 cm now we know that for convex lens 1/f = 1/v +1/u        = 1/26 +1/104 so f = 20.8 so the answer to this is (a,c) 20.8

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