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  • Which one of the following spherical lenses does not exhibit dispersion? The radii of curvature of the surfaces of the lenses are as given in the diagrams.Option

Which one of the following spherical lenses does not exhibit dispersion? The radii of curvature of the surfaces of the lenses are as given in the diagrams.

Option: 1


Option: 2


Option: 3


Option: 4


Answers (1)

best_answer

\mathrm{\frac{1}{f}=(\mu-1)\left(\frac{1}{R_{1}}-\frac{1}{R_{2}}\right)\quad \ldots(1)}
For no dispersion; \mathrm{d\left(\frac{1}{f}\right)=0}

Diff. equation (1):
\mathrm{d\left(\frac{1}{f}\right)=d \mu\left(\frac{1}{R_{1}}-\frac{1}{R_{2}}\right)=0 \quad \Rightarrow R_{1}=R_{2}}

Posted by

manish painkra

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