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Physics-10th Light - Reflection and Refraction CBSE Board 2025 Hard

A student placed a candle flame at different distances from a convex lens and focused its image on a screen.…

A student placed a candle flame at different distances from a convex lens and focused its image on a screen. He recorded his observation in tabular form as given below : Analyse the observation table and on the basis of your analysis only, answer the following questions (without doing any calculations) :
  1. (a)What is the focal length of the convex lens used ? Give reason to justify your answer.
  2. (b)Which one of the sets of observations is not correct and why ?
  3. (c)Draw ray diagram to show image formation for any correct set of observation.

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