D 057 Oare ength 65 Two thin convex lenses of focal length

Last updated: 6/28/2023

D 057 Oare ength 65 Two thin convex lenses of focal length 10 cm and 15 cm are separated by a distance of 10 cm The focal length of the combination is 1 4 2 cm 2 6 cm 3 10 cm 4 15 cm