Which sign convention for focal length f and radius of curvature R is correct?

Question

Which sign convention for focal length f and radius of curvature R is correct? — Exam MCQ

rrbjepyq.in · Accepted Answer

D. Concave: f negative, R negative — Under the Cartesian convention, both f and R are negative for a concave mirror and positive for a convex mirror.

rrbjepyq.in · Answer

A. Convex: f negative, R positive

rrbjepyq.in · Answer

B. Convex: f negative, R negative

rrbjepyq.in · Answer

C. Concave: f positive, R negative