Q. 274.3( 79 Votes )

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Answer :

Add few lines about the experiment by which the focal length is calculated.

We can also add a diagram (like such these are copyright)

1. The lens should be help properly and vertically.

2. At least 3-4 observations should be taken .

3. The lens should be moved forward and backward to get a clear and sharp image on the screen.

4. The base of lens, screen and measuring scale should be in a straight line.

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