4. If the radius of curvature of a lens is 30 cm, then what is its focal length?
Answers
Answered by
3
Explanation:
f = r/2
OR
r = 2f
so the answer will be 30/2 = 15 cm
Answered by
3
Answer:
Explanation:
R=2f
2f = 30
f = 15cm
therefore, focal length is 15cm
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