17. 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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Explanation:
THE GIRL MUST HAVE DIRECTED THE RAY OF LIGHT ALONG THE DIRECTION OF THE OPTICAL CENTRE OF THE LENSES BECAUSE THE RAY OF LIGHT PASSES STRAIGHT THROUGH THE OPTICAL CENTRE OF THE LENS..
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