Focal length of the given lens increases in accordance with lens maker’s formula
1/f =(n-1)(1/R1 -1/R2) because Ngw <nga.
Class 12 Physics
Chapter 9 Ray Optics and Optical Instruments Session 2024-2025.
A convex lens is held in water. What change, if any, do you expect in its focal length?
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When a convex lens is held in water, its focal length increases. Since water has a higher refractive index than air, the refractive power of the lens decreases, resulting in a longer focal length compared to its value in air.
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