Question

focal distance of convex lens​

Answer 1

Explanation:

• For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens.
• For a converging lens (for example a convex lens), the focal length is positive and is the distance at which a beam of collimated light will be focused to a single spot.

Answer 2

Explanation:

The distance between optical centre O of lens to focal point F is called the focal length of convex lens. Similarly, for concave lens or divering lens, parallel rays coming from one side of lens are getting diverged. on other side and appears on other side that they are coming from a point F