Question

54. Hold a screen in front of a convex lens and adjust it to get a sharp and bright image
of a distant object, then the distance between the optic centre and the image gives
A. Refractive index
B. Focal length
C. Radius of curvature
D. Object distance​

Answer 1

Answer:

the answer is object distance

Answer 2

If we get sharp and bright image of distant object then distance between optic centre and image gives focal length

Explanation:

• B is the answer of this question

• On Convex lens , when light rays enter on this lens , they converge on the point on lens opposite side.

• Convex lens also called Converging lens

• Rays converge on the point, that point called as focal point

• The distance between the lens centre and Focal point called Focal length