1.

Focal length of concave lens is 15cm.if an image is 10cm away from this lens, at what distance the object from the lens is placed?

Answer»

- 6cm or 6 cm away from the lensExplanation:we know LENS FORMULA, 1/F = 1/v - 1/U,where f is FOCAL length            v is position of image             u is position of objecthere, by putting values we get1/15 = -1/10 - 1/u1/15+ 1/10 = - 1/uby taking lcm(2+3)/30 = -1/u5/30  = -1/u1/6  = -1/uu = -6 cm



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