4 : Draw a ray diagram to show the formation of real image of an object
when refraction of light takes place through a convex lens. Mark as per new
cartesian sign convertion the object distances (u) image distances(v)
and the focal length (f) and also write the relation between u, vand f.
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When light ray enters a medium of different refractive index from another medium, it undergoes change of velocity. This is known as refraction of light. The change in velocity happens both in direction and magnitude of the light wave.
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