– If two thin convex lenses each of the focal length 10 cm are kept co-axially and separated by a distance of 15 cm from each other and having an equivalent focal length of 20 cm then the position of the first principal point from the first lens is ….
A. 15 cm
B. 25 cm
C. 30 cm
D. 20 cm
Answer:C
– If two thin convex lenses each of the focal length 10 cm are kept co-axially and separated by a distance of 15 cm from each other and having an equivalent focal length of 20 cm then the position of the first principal point from the first lens is ….
A. 15 cm B. 25 cm C. 30 cm D. 20 cm