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  4. When a lens of refractive index n1 is placed in a liquid of refractive index n2 the lens looks to be disappeared only if

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Q. When a lens of refractive index $ n_{1} $ is placed in a liquid of refractive index $ n_{2}$ the lens looks to be disappeared only if

Delhi UMET/DPMTDelhi UMET/DPMT 2010Ray Optics and Optical Instruments

Solution:

If refractive index of lens $ n_{1} $ is equal to refractive index of liquid $ n_{2} $ , then lens be haves as a plane glass plate and becames invisible in the medium.