class 12

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JEE Advanced

Consider two palne convex lanse of same radius of curvature and refrective index $n_{1}$ and $n_{2}$ respectively. Now consider two cases :

Case - I : When $n_{1}=n_{2}=n$, then equivalent focal length of length is $f_{0}$

Case - II : When $n_{1}=n,n_{2}=n+Δn$, then equilivant focal length of lens is $f=f_{0}+Δf_{0}$

Then correct options are :