An object is placed at a distance of 100cm from the combination of a convex lens of focal length 20 cm and a concave lens of focal lens 100 cm. Find the focal length and the power of combination also find the position of the image formed.
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Total focal length = -120cm or -1.2m
Power =-5/6
v = +11/6
Power =-5/6
v = +11/6
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