Question

1. Numericals
7. The focal length of a concave mirror is 18 cm. Find its radius of curvature.
2. The radius of curvature of a convex mirror is 20 cm, find its focal length.
Project-Detect infrared radiation
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Answer 1

Answer:

7. r=f/2 this is the formula

now put the value that is

18/2 = 9

r=9