Two lenses are kept in contact, what is the combined power of the combination. Given power of the first lens is + 4 D, focal length of the second lens is 20 cm and is used for correction of myopia. PLZ BATADO TEST CHAL RAHA HAI
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Pcomb=P1+P2, p1=+4D, here P2=100/F and this lens use in correction of myopia means it is concave lens so F is negative then p2= -100/20, p2= -5D, then Pcomb.= +4-5 , Pcomb.= -1D
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