Concave lens – Principal focal point (two of them)
Concave lens: Principal focal length – be careful
Why is the power of concave lens negative? - Quora
Virtual Images
Lenses
FOCAL LENGTH OF LENSES
A convex lens A of focal length 20cm and a concave lens G of focal length 5cm are kept along the same axis with the distance between them. If a parallel beam
Why is a concave lens called a negative lens? - Quora
25.6 Image Formation by Lenses – College Physics: OpenStax