Electric Current And Magnetism Ques 13

Question: When an optician prescribes a - 5D lens, what does it mean?

Options:

A) Concave lens of 20 cm focal length

B) Convex lens of 5 cm focal length

C) Concave lens of 5 cm focal length

D) Convex lens of 5 cm focal length

Show Answer

Answer:

Correct Answer: A