A thin equiconvex lens of glass has radii of curvature of its surfaces 30 cm each. This lens has different medium on its two sides as shown in the figure. The refractive indices of the mediums on the two sides of the lens are 1.2 and 1.6, and refractive index of the glass is 1.5. The focal length (in cm) of the lens in the shown figure is for parallel beam incident from left

Engineering

Physics

Magnet and Magnetic Dipole Moment

Question

A thin equiconvex lens of glass has radii of curvature of its surfaces 30 cm each. This lens has different medium on its two sides as shown in the figure. The refractive indices of the mediums on the two sides of the lens are 1.2 and 1.6, and refractive index of the glass is 1.5. The focal length (in cm) of the lens in the shown figure is for parallel beam
incident from left

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$\frac{μ_{2}}{v} - \frac{μ_{1}}{u} = \frac{μ_{0} - μ_{1}}{R_{1}} + \frac{μ_{2} - μ_{0}}{R_{2}}$
When u = $\infty$ V = f
$\frac{1 .6}{f} = \frac{1 .5 - 1 .2}{+ 30} + \frac{1 .6 - 1 .5}{- 30}$
f = 240 cm

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