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Ray Optics and Optical Instruments — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsRay Optics and Optical Instruments1 Mark
Question
A convex lens with a refractive index is placed in that medium whose refractive index is equal to the refractive index of the lens. What will be the focal length of the lens in this medium?
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Answer

In this condition the lens will behave like a plane glass plate, hence its focal length will be infinite.

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