Question

A light ray passes through a point inside a lens without any deviation. That point of the lens will be its:

• A. Focus
• B. Centre of curvature
• C. Optical centre
• D. None of the above

Hint:

The optical centre of a lens is the point through which light passes without any deviation.

Answer 1

The Correct Option is C

In a lens, the optical centre is the point at which light rays pass through without deviation. It is the central point of the lens and is where no refraction occurs for light passing through it.
Step 1: Focus.
The focus is the point where parallel rays of light converge after passing through the lens. A light ray passing through the focus will not pass without deviation.
Step 2: Centre of curvature.
The centre of curvature is a point related to the spherical surface of the lens. Light rays passing through the centre of curvature do not pass through the lens without deviation.
Step 3: Optical centre.
The optical centre is the point inside the lens where a light ray passes through without any deviation. This is the correct answer.

Step 4: Conclusion.
Thus, the correct answer is (C) Optical centre.