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The focal length of a convex lens is 25 cm, then what is a power?A +2.50 B. + 5.0D C. + 4.00 D.+ 10.0DThe light of which colour has maximum velocity in the dispersion of white light bya gass prism?A Red B. VioletC. Blue D. Green |
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Answer» I DON'T UNDERSTAND QUESTION? Explanation: WRITE PROPERLY. |
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