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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 ?

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Since refractive index of lens is less than refractive index of surroundings, it will behave as a convex lens.
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Concave lens is immersed in medium having refractive index greater than the refractive index of the material of the lens therefore it will be have such converging lens .
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Teaching professional with 12 of experience in teaching

The lens behaves as convex. The reason is when the refractive index of a medium is more than concave lens then the nature of the lens changes to Convex from concave.
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1/F=-(n-1)÷R
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1.75
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M.Sc. Biomedical Genetics, B.Sc. Biotechnology

Since refractive index of lens < refractive index of surrounding It behaves like converging lens.
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Professional theoretical physicist

from this problem we may knoq that the refractive index of the given lens is less than the refractive index of surroundings, so it will behave as a convex lens.
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B.Tech(EC/EE/IN),Math(IX,X,XI,XII std.),Physics(IX,X,XI,XII std.) CBSE/ICSE/IB.

concave lens will change into convex lens
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As the refractive index of the medium =1.65 is more than that of a concave lens =1.5 it's nature will change and lens will become a convex lens
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