a girl was playing with a thin beam of light from her laser torch by directing it from different directions on a convex lens held vertically.she was surprised to see that in a particular direction the beam of light continues to move along the same direction after passing through the lens.state the reason for this observation.

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Solution

It means the beam of light is passing through optical centre of lens. A beam of light that passes through the optical centre of convex lens continues to move along the same direction after passing through the lens, since the light beam travels at angle of 90⁰ from the plane of the surface do not bend.

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