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Analyse the following observation table ...

Analyse the following observation table showing variation of image distance (v) with object distance (u) in case of a convex lens and answer the questions that follow, without doing any calculation :

What is the focal length of the convex lens? Give reason in support of your answer.

Text Solution

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f = +15 cm
Reason: Object at S. No. (3) indicates u = -30 cm, v = + 30 cm
Thus, object is at 2F, (2f=30 cm)
`:.` f = 15 cm
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