Question

What is common between convex lens and concave lens?

• A. Both can form real images
• B. Both can form virtual images
• C. Both can produce negative magnification
• D. When object is at focal point, image is formed at $\infty$

Answer 1

Answer: (B)

Both can form virtual images

Convex lens can form both real and virtual images with positive or negative magnification. It can form diminished or magnified images. When object is at focal point, image is at infinity.

Concave lens can form only virtual images with positive magnification. It can form only diminished images. Image is between object and lens independent of position of object.