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two lenses of focal length +10cm and+25 cm are kept in contact . Find the power of the.combination |
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Answer» First convert f in metres so lens 1 has f=0.1m and lens2 has f=0.25m. Power of lens1 = 1/0.1 = 10D Power of lens2 = 1/0.25 = 4D Effective power = P1+P2 = 10D + 4D = 14D. |
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