Question

The focal length of convex lens______​

Answer 1

Answer:

is positive...

Explanation:

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Answer 2

Explanation:

YOUR ANSWER IS THIS

Focal length is a well known word in optical physics. Focal length is distance over which the parallel rays either converge or diverge.

For convex lens the focal length is positive. On the other hand, the focal length of concave lens is negative.

Thus, for convex lens, the focal length is a distance over which all the parallel rays will converge. A certain point over that distance all the parallel rays will converge, that point is known as focal point.

Similarly, for concave lens, the focal length is a distance where the parallel rays will diverge.