Practice Questions CBSE - Science Class 10 (2023 Boards)

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Question 17 [Assertion Reasoning] Important

Question 18 [Assertion Reasoning] Important

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Question 20 [Assertion Reasoning]

Question 21 (Choice 1) Important

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Question 31 (a)

Question 31 (b) Important

Question 32 (Choice 1)

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Question 33 (a)

Question 33 (b)

Question 33 (c) Important

Question 34 (a) - Choice 1

Question 34 (b) - Choice 1 Important

Question 34 (c) - Choice 1

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Question 34 (b) - Choice 2]

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Question 37 (a) - Choice 1 [Case Based]

Question 37 (b) i - Choice 2 [Case Based] Important

Question 37 (b) ii - Choice 2 [Case Based] Important

Question 38 (a) - Choice 1 [Case Based]

Question 38 (b) - Choice 1 [Case Based] Important

Question 38 (c) - Choice 1 [Case Based]

Question 39 (a) - Choice 1 [Case Based] Important

Question 39 (b) - Choice 1 [Case Based]

Question 39 (c) - Choice 1 [Case Based] You are here

Question 39 (d) - Choice 1 [Case Based] Important

Question 39 (d) - Choice 2 [Case Based] Important

(c) In the refracting telescope given in the passage, what should be the distance between the two lenses? (Use the first ray diagram in the passage to answer it.)

 

Answer:

(c)

  • Incident light from infinity is being converged to a certain point by the first lens. 
  • Hence this distance is equal to the focal length of the objective lens. 
  • In the second lens, the light diverging from a point is being made parallel , also implying this point lies at the focus of the eye piece. 
  • Thus the 2nd part of the distance is the focal length of the second lens

Thus, the distance between the 2 lenses is equal to the sum of the focal length of the objective and eyepiece .

 

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo