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[" 98.Four lenses of focal length "+-15c...

[" 98.Four lenses of focal length "+-15cm" and "10],[+-150cm" are available for making a tele- "],[" scope.To produce the largest magnifica- "],[" tion,the focal length of the eyepiece should "],[" be "],[[" (a) "+15cm," (b) "+150cm],[" (c) "-150cm," (d) "-15cm.," (1994) "]]

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