Question

if a biconvex lens is focussed towards sun a pointed image is formed at 10 cm from
optic center find radius of curvature​

Answer 1

Answer:

20cm

Explanation:

Firstly, refer to the image to find out how a biconvex or converging lens looks like. In a biconvex lens, when the object is placed at infinity, the image is formed at the principle focus F, which is half of the radius of curvature.

The image formed is real, inverted and highly diminished in this case.

Here, the image is formed at 10 cm away from the optical center O. This means the principal focus F is located at a distance of 10 cm away from the optical center.

We know that the principal focus is located at half the distance away from O as compared to the center of curvature, C.

Therefore, r = 2 f

Hence, radius of curvature = 2 * 10 cm = 20 cm

Hence the answer is 20 cm.