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A student focussed the Sun rays using an optical device 'X' on a screen S as shown.

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A student focussed the Sun rays using an optical device 'X' on a screen S as shown.

What conclusion can be drawn based on this about device X?

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Light rays from infinity are converged at the focal point of the convex lens. Therefore, the focal length of the convex lens is 20 cm.
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