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  •  Radii of curvature of a convex lens are and <img alt="30 \mathrm{~cm}" src="https

 Radii of curvature of a convex lens are 20 \mathrm{~cm} and 30 \mathrm{~cm} and its focal length if 24 \mathrm{~cm}. Refractive index of the lens will be

Option: 1

1.33


Option: 2

1.5


Option: 3

1.71


Option: 4

None of these


Answers (1)

best_answer

\mathrm{\text { As } \frac{1}{f}=(\mu-1)\left(\frac{1}{R_{1}}-\frac{1}{R_{2}}\right) }

\mathrm{\therefore \frac{1}{24}=(\mu-1)\left(\frac{1}{20}-\frac{1}{-30}\right)=\frac{(\mu-1)}{12} \Rightarrow \mu=1.5}

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Kuldeep Maurya

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