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JEEMAIN and NEET
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Physics
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Class12
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Ray Optics and Optical Instruments
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A convex lens of focal length 40 cm is kept in contact with a concave lens of focal length 25 cm. What is power of this combined lens system.
$(a)\;+6.50\;D \\ (b)\;-6.50\;D \\ (c)\;+1.5\;D \\ (d)\;-1.5 \;D $
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