Question

A parallel beam of light on passing through a convex lens meets at a point on the principal axis. This point is called:
(a)first principal focus of lens
(b)second principal focus of lens
(c)optical centre lo lens
(d)none of the above.​

Answer 1

Answer:

a option is correct answer

Answer 2

Answer:

(d) none of the above

Explanation:

and correct answer is focal length of convex lens

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