Ray Optics and Optical Instruments

Question: Focal length of a converging lens in air is R. If it is dipped in water of refractive index 1.33, then its focal length will be around (Refractive index of lens material is 1.5)



1) R
2) 2R
3) 4R
4) R / 2
Solution: Explanation: No Explanation
Refraction at Curved Surface

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