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(C) The focal length of a lens is given by the Lens Maker's Formula: $\frac{1}{f} = (\frac{\mu_l}{\mu_m} - 1)(\frac{1}{R_1} - \frac{1}{R_2})$.Since th

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Glass plate

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(C) The focal length of a lens is given by the Lens Maker's Formula: $\frac{1}{f} = (\frac{\mu_l}{\mu_m} - 1)(\frac{1}{R_1} - \frac{1}{R_2})$.Since the lens is hollow and filled with air,the refractive index of the medium inside the lens $(\mu_l)$ is equal to the refractive index of the surrounding medium $(\mu_m)$,assuming the lens is submerged in air.Therefore,$\frac{\mu_l}{\mu_m} = 1$.Substituting this into the formula: $\frac{1}{f} = (1 - 1)(\frac{1}{R_1} - \frac{1}{R_2}) = 0$.This implies $f = \infty$.$A$ lens with an infinite focal length acts as a plane glass plate,as it does not converge or diverge light rays.

$A$ hollow convex lens of glass will behave like a

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