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  • The size of the image of an object which is at infinity, as formed by a convex lens of focal length 30cm is 2 cm. If a concave lens of focal length 20cm is placed between the convex lens and the image at a distance of 26cm from the convex lens, calculate

The size of the image of an object which is at infinity, as formed by a convex lens of focal length 30cm is 2 cm. If a concave lens of focal length 20cm is placed between the convex lens and the image at a distance of 26cm from the convex lens, calculate the new size of the image.

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\\\frac{1}{v}=\frac{1}{4}-\frac{1}{20}\\v=5cm\\m=v/u=5/4=1.25\\h'=1.25\times2=2.5cm

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