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Wave Optics
Question
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A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65. What is the nature of the lens ? 

Answer

Here, a concave lens is placed in a medium of refractive index greater than the refractive index of the material of the lens. 
So, the given lens will behave as a diverging lens. 

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