Ray Optics

JEE Main level, single correct, medium

212 of 295

Question 212 of 295

A thin glass (refractive index 1.5) lens has optical power of −5D-5 D in air. Its optical power in a liquid medium with refractive index 1.61.6 will be

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Answer: (D) None of these

PmPair=(μℓμa−1)(μℓμm−1)\frac{\mathrm{P}_{\mathrm{m}}}{\mathrm{P}_{\mathrm{air}}}=\frac{\left(\frac{\mu_{\ell}}{\mu_{\mathrm{a}}}-1\right)}{\left(\frac{\mu_{\ell}}{\mu_{\mathrm{m}}}-1\right)}
Pm=5/8D\mathrm{P}_{\mathrm{m}}=5 / 8 \mathrm{D}

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