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A biconvex lens made of material with refractive index `n_(2)`. The radii of curvatures of its left surface and right surface are `R_(1)` and `R_(2)`. The media on its left and right have refreactive indices `n_(1)` and `n_(3)` respectively. The first and second focal lengths of the lens are respectively `f_(1)` and `f_(2)`. Assume that `n_(1) = n_(3)`. Which of the following statements is not correct ?A. `f_(1) = f_(2)`.B. `f_(3)` is inversely proportional to `n_(3) - 1`.C. If `R_(1) ` and `R_(2)` are unequal, the focal length would depend on the direction in which light travels through the lens.D. `f_(1)` may be negative if `n_(1) gt n_(2)`. |
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Answer» Correct Answer - C |
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