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CBSE Class 10 Science 2015 Term II Delhi Set 1
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Question : 31
Total: 36
A student has obtained a point image of a distant object using the given convex lens. To find the focal length of the lens he should measure the distance between the :
lens and the object only
lens and the screen only
object and the image only
lens and the object and also between the object and the image
Solution:
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