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An object is placed in front of two convex lenses one by one at a dis†an ce u from the lens. The focal lengths of the lenses are 30cm and 15cm respectively. If the size of image formed in the two cases is same, then u is 1)15 c 2)20 cm 3)25 cm |
| Answer» An object is placed in front of two convex lenses one by one at a dis†an ce u from the lens. The focal lengths of the lenses are 30cm and 15cm respectively. If the size of image formed in the two cases is same, then u is 1)15 c 2)20 cm 3)25 cm | |