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Read the passage and note the following observations. Answer the questions.
A student focussed the image of a candle flame on a white screen by placing the flame at various distances from a convex lens. He noted his observations as:
Which set of observations is incorrect and why?
  • a)
    Object distance can not be smaller than image distance
  • b)
    Image should form at 15cm only
  • c)
    Image should form at infinity
  • d)
    Object is kept at optical centre
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Read the passage and note the following observations. Answer the ques...
(a) From the table of observation, it is clear that for u = 30, v = 30 cm. This means that both u and v must be equal to twice the focal length of the convex lens. Focal length of the convex lens = 30/2 = 15cm.
(b) The observation (v) is incorrect. For this observation u = 15 = /, i.eThe object is at the focus and the image must be formed at infinity and not 70 cm.
(c) Since m = v/u , the size of the image will be equal to the size of the object, if v = u i.e., for the observation (iii).
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Read the passage and note the following observations. Answer the questions.A student focussed the image of a candle flame on a white screen by placing the flame at various distances from a convex lens. He noted his observations as:Which set of observations is incorrect and why?a)Object distance can not be smaller than image distanceb)Image should form at 15cm onlyc)Image should form at infinityd)Object is kept at optical centreCorrect answer is option 'C'. Can you explain this answer?
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