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For the same thickness of the lens, if the radius of curvature is increased, the focal length willd. be imposible to estimate,a. reduced. b. remain unchanged.c. increased.At what distance a watch maker must hold his lens from the watch?2. at the focal lengthb. at less than focal lenghc. at more than the focal length d. at zero distanceExercise :explain the working of compound microscope by focal length of convex lens.'hen would virtual image produced by convex lens ? Why doesn't virtual image drawn on aTeen?e your opinion about radius of curvature of a convex lens having different F, and F,? Whatuld the lens called having equal F, and F, ? |
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