InterviewSolution
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InterviewSolution
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Two glasses with refractive indices of `1.5 and 1.7` are used to make two indentical double convex lenses. Find the ratio between their focal lengths. How will each of these lenses act on a ray parallel to its optical axis if the lenses are submerged into a transparent liquid with a refractive index of `1.6?` |
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Answer» Correct Answer - A::B::C::D (a) `1/f=(mu-1)(1/R_1-1/R_2)` `:. fprop(1/(mu-1))` or `f_1/(f_(2))=(mu_2-1)/(mu_1-1)=(1.7-1.0)/(1.5-1.0)=1.4` (b) If refraction index of the liquid (or the medium) is greater than the refraction index of lens it changes its nature of converging lens behaves as diverging. |
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