30. Focal length of the convex lens whose radius of curvature is 90 cm is A) 30 cm B) 60 cm C) 45 cm D) 90 cm
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30. Focal length of the convex lens whose radius of curvature is 90 cm is A) 30 cm B) 60 cm C) 45
30. Focal length of the convex lens whose radius of curvature is 90 cm is A) 30 cm B) 60 cm C) 45 cm D) 90 cm
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Answer:
C)45
Explanation:
R=2f
Answer:
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