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Q.

The focal length of the convex lens is always :

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a

Infinite

b

Positive 

c

Negative

d

Zero 

answer is A.

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Detailed Solution

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  • A convex lens converges light rays on its right side. Due to this the focus of a convex lens lies on the right side of the lens.
  • Since the distances measured on the right side of a lens are considered positive, the focal length of a convex is always positive.
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