Single Answer MCQ
Q-00106606
The radius of curvature of a concave mirror is 30 cm. What is the focal length?
1
-15 cm
2
15 cm
3
-30 cm
4
30 cm
Answer and Solution
Answer
A. -15 cm
Solution:
The focal length (f) is half the radius of curvature (R). For a concave mirror, f = -R/2 = -30 cm/2 = -15 cm.
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