Question:
A double concave lens of refractive index 1.5 with its two spherical surfaces of radii R1 = 30 cm and R2 = 45 cm is kept in air. Its focal length is
A double concave lens of refractive index 1.5 with its two spherical surfaces of radii R1 = 30 cm and R2 = 45 cm is kept in air. Its focal length is
Updated On: May 17, 2024
- 15 cm
- 37.5 cm
- -18 cm
- -36 cm
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The Correct Option is D
Solution and Explanation
The correct option is (D): -36 cm
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