Ray Optics and Optical Instruments

Question: A bi-convex lens made of glass (refractive index 1.5) is put in a liquid of refractive index 1.7. Its focal length will



1) Decrease and change sign
2) Increase and change sign
3) Decrease and remain of the same sign
4) Increase and remain of the same sign
Solution: Explanation: No Explanation
Refraction at Curved Surface

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