A student took a lens and focused it towards the Sun. then he took a paper and held it in such a way that a bright spot was formed. Identify the lens used. What represents the bright spot on the paper? Name the phenomenon responsible for this spot . Find the focal length
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Since the sunlight appeared as a bright spot, the rays were converged to give a single spot. Thus the lens used is converging i.e. convex lens.
The bright spot on the paper represents the Focus of the lens. This is because parellel light rays from the sun converge at one point on the focus. This is due to refraction and convergence of sunrays through the convex lens.
To find the focal length, measure the distance between the paper and the lens.
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