Two thun convex lens of power 4D and 6D are placed co axiaaly at a distance of 20 cm pArt find the focal length and power of the com bination of lenses
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(a)40 cm to left of 1st lens
(b)40 cm to right of 1st lens
(c)40 cm to left of second lens
(d)40 cm to right of second len
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