Two lenses of power +12D and -2D are combined together. What is their equivalent focal length?
A. 10 cm
B. 12.5 cm
C. 16.6 cm
D. 8.33 cm
Answer:A
Two lenses of power +12D and -2D are combined together. What is their equivalent focal length?
A. 10 cm B. 12.5 cm C. 16.6 cm D. 8.33 cm