InterviewSolution
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                                    . Tendrils encirÄle of coll arond thit Ujtl5. A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in closecontact with each other. Calculate the lens power of this combination | 
                            
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Answer»  Power = 1/f where f is focal length in meternow p1 = 100/25= 4 (for convex lens)p2 = -100/10 = -10(power is negative because focla length of concave lens is negative)now resultant power = p1+p2 = 4+(-10)=-6  | 
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