एक्सप्लेन द फोकल लेंथ ऑफ 15 सेंटीमीटर कैलकुलेट इट्स पावर
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An equiconex lens of power p is cut into two equal halves by a plane perpendicular to its principal axis .The refractive index of concave lens is 1.2. This lens is immersed in a liquid of refractive index 1.4.
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