Question

The distance between the focal point and the optic centre gives the

• A. radius of curvature
• B. focal length
• C. object distance
• D. image height

Answer 1

The Correct Option is B

Correct answer: focal length
 
Explanation:
In a lens, the focal length is the distance between the optic centre (the central point of the lens) and the focal point (the point where parallel rays of light converge or appear to diverge after passing through the lens). 

This is a key parameter that determines the converging or diverging power of the lens. 

Hence, the correct answer is: focal length.