two thin lenses of focal length +20cm and -15cm are kept in contact. what is the focal length and power of the combination
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total focal length = 20 - 15 = 5 CM.
power = 1/f + 1/f = 1/20 + 1/-15 = -1/60
power = 1/f + 1/f = 1/20 + 1/-15 = -1/60
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Guided by kvs
formula Hai f1×f2/f1+f2
ans =-60
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