1.Two thin lenses of focal lengths f1f_1f1 and f2f_2f2 are in contact and coaxial. The power of the combination isa.f1+f2f1f2\frac{f_1 + f_2}{f_1 f_2}f1f2f1+f2b.f1f2\sqrt{\frac{f_1}{f_2}}f2f1c.f2f1\sqrt{\frac{f_2}{f_1}}f1f2d.f1+f22\frac{f_1 + f_2}{2}2f1+f2Login to continueOnly logged in users canattempt or see the solution.
