Question

Identify the mistake in the following ray diagram.

• A. Image formed should be virtual and enlarged.
• B. Image should be formed beyond the centre of curvature, and enlarged.
• C. Image formed should be virtual and diminished.
• D. Optical centre should be at the centre of curvature, not at the centre of the lens as shown.

Answer 1

The correct option is B Image should be formed beyond the centre of curvature, and enlarged.

In case of a convex lens, for objects placed in between principal focus and centre of curvature, image should be formed beyond centre of curvature on the other side. Also, the image hence formed should be magnified (enlarged). Optical centre of the lens is present at the centre of the lens only. A ray passing through the optical centre goes undeviated.