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 biconvex lens made of material with refractive index n_(2). The radi

1.	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 ?
Answer» `f_(1) = f_(2)`. `f_(3)` is INVERSELY proportional to `n_(3) - 1`. If `R_(1) ` and `R_(2)` are unequal, the focal length would depend on the direction in which LIGHT travels through the lens. `f_(1)` may be negative if `n_(1) gt n_(2)`. Answer :C

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