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Two plano-concave lenses of glass of re...

Two plano-concave lenses of glass of refractive index 1.5 have radii of curvature of 20 and 30 cm. They are placed in contact with curved surface towards each other and the space between them is filled with a liquid of refractive index `(4)/(3)`, find the focal length of the system.

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To find the focal length of the system consisting of two plano-concave lenses in contact with each other and filled with a liquid, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Parameters:** - Refractive index of glass, \( \mu_g = 1.5 \) - Radii of curvature: - For the first lens, \( R_1 = +\infty \) (plano surface) ...
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