Question

(a) focus of concave Mirrors =(+or-) (b) focus of convex mirrors=(+or-) (c) focus of concave lens =(+or-) (d) focus of convex lens= (+or-) ​

Answer 1

Explanation:

Focus of concave mirror = negative

Focus of convex mirror = positive

Focus of concave lens = negative

Focus of convex lens = positive