When will the convergent nature of a convex l | vedclass

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(C) The focal length of a lens in a medium is given by the Lens Maker's Formula: $\frac{1}{f_m} = (\frac{n_l}{n_m} - 1)(\frac{1}{R_1} - \frac{1}{R_2})

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In both $(a)$ and $(b)$

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(C) The focal length of a lens in a medium is given by the Lens Maker's Formula: $\frac{1}{f_m} = (\frac{n_l}{n_m} - 1)(\frac{1}{R_1} - \frac{1}{R_2})$.Since the refractive index of water $(n_w \approx 1.33)$ and oil $(n_o > 1.33)$ are both greater than the refractive index of air $(n_a \approx 1.0)$,the relative refractive index $\frac{n_l}{n_m}$ decreases when the lens is immersed in these liquids.As a result,the focal length $f_m$ increases,which means the power of the lens $(P = \frac{1}{f})$ decreases.Therefore,the convergent nature of the convex lens is less in both water and oil compared to air.

When will the convergent nature of a convex lens be less as compared to its nature in air?

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