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  • A double convex lens of focal length 20 cm is made of glass of refractive index 3 / 2. When placed completely in water <img alt="\mathrm{\left({ }_a \mu_w=4 / 3\right)}" src="https://entrancec

A double convex lens of focal length 20 cm is made of glass of refractive index 3 / 2. When placed completely in water \mathrm{\left({ }_a \mu_w=4 / 3\right)} , its focal length will be

Option: 1

80 cm


Option: 2

15 cm


Option: 3

17.7 cm


Option: 4

22.5 cm


Answers (1)

best_answer

\mathrm{\frac{f_w}{f_a}=\frac{\left(\mu_g-1\right)}{\left(\frac{\mu_g}{\mu_w}-1\right)} \Rightarrow \frac{f_w}{f_a}=4 \\ }

\mathrm{ \therefore f_w=4 \times f_a=4 \times 20=80 \mathrm{cms} . }

Posted by

Anam Khan

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