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A student focused the image of a candle ...

A student focused the image of a candle flame on a white screen by placing the flame at various distance from a convex lens. He noted his observation as mentioned in the following table.

Analyze the above table and answer the following questions.
What is the focal length of the convex lens?

Text Solution

Verified by Experts

When object is at distance 2f, image is fonned at distance 2f on the other side. In this case, when u = 30 cm, v = 30 cni This implies, 2f = 30 cm
`therefore` The focal length of the convex lens is 15 cm
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