1.

(c) A convex lens of focal length 25 cm ond #concave lens of focal length 10 m rplaced in close contact with each other Celculate the lens power of this combbinationstion

Answer»

Power = 1/f where f is focal length in meter p1 = 100/25= 4 (for convex lens)

p2 = -100/10 = -10 (power is negative because focal length of concave lens is negative)

Now,Resultant power = p1+p2 = 4+(-10)= -6



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