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  3. 10th Class
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10th Class Science Solved Paper - Science-2017 Delhi Set-I

  • question_answer
    Three students A, B and C focussed a distant building on a screen with the help of a concave mirror. To determine focal length of the concave mirror they measured the distances as given below     
    Student A: From mirror to the screen
    Student B: From building to the screen
    Student C: From building to the mirror
    Who measured the focal length correctly?
    (a) Only A
    (b) Only B
    (c) A and B
    (d) B and C
     

    Answer:

    (a) Only A


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