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A convex lens of power 5 D and a concave lens of power 7.5 D are placed in contact with each other. What is the:(a) Power of this combination of lenses?(b) Focal length of this combination of lenses ? |
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Answer» A convex lens of power 5 D and a concave lens of power 7.5 D are placed in contact with each other. What is the: |
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