– Two thin convex lenses each of focal length 10 cm are kept co-axially and separated by a distance of 5 cm from each other. The equivalent focal length of the combination is …..
A. 8 cm
B. 9 cm
C. 66 cm
D. 66 m
Answer:C
– Two thin convex lenses each of focal length 10 cm are kept co-axially and separated by a distance of 5 cm from each other. The equivalent focal length of the combination is …..
A. 8 cm B. 9 cm C. 66 cm D. 66 m