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CBSE Class 10 Answered

Why does the convex lens converge the rays of light?
Asked by rushabhjain.a | 10 Mar, 2019, 09:21: PM
answered-by-expert Expert Answer
This has to do with the geometry of the lens curvature. Snell’s law shows that when light travels from a medium of lower index to one of comparatively higher index of refraction, the light refracts toward the “normal” (the perpendicular axis to the surface of the lens). This should explain why a convex lens would “focus”; light essentially refracts toward the normal, which has the same effect as focusing toward the geometrical central axis of the lens. The “normal” is not the same throughout the lens, because the curvature of the lens changes spherically across its surface. At every point on the surface, the refraction of incident light toward the normal will result in light being focused (for a convex lens).
Answered by Ankit K | 10 Mar, 2019, 10:09: PM
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