Lens Formula kya h

1.	Lens Formula kya h
Answer» 1/v-1/u=1/f 1/f = 1/v - 1/u For concave lens focal length is always negative Distance of object (u) always negative either in concave or in convexv is +ve in convex lensv is -ve in concave lens 1/f=1/u-1/v

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