– Two thin convex lenses have focal lengths 5 cm and 10 cm. If the equivalent focal length is 5 cm, the separation between two lenses will be ….
A. 3 cm
B. 5 cm
C. 7 cm
D. 9 cm
Answer:C
– Two thin convex lenses have focal lengths 5 cm and 10 cm. If the equivalent focal length is 5 cm, the separation between two lenses will be ….
A. 3 cm B. 5 cm C. 7 cm D. 9 cm