As shown in the figure, a combination of a thin piano concave lens and a thin piano convex lens is used to image an object placed at infinity. The radius of curvature of both the lenses is 30 cm and refraction index of the material for both the lenses is 1.75. Both the lenses are placed at distance of 40 cm from each other. Due to the combination , the image of the object is formed at distance x = _______cm, from concave lens.
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(120)
Image from L 1 will be virtual and on the left of L 1 at focal length 40 cm. So the object for L 2 will be 80 cm from L 2 which is 2f. Final image is formed at 80 cm from L 2 on the right. So x = 120
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