CUET Preparation Today
If a convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power? |
6.5D -6.5D 7.5D -0.75D |
-0.75D |
ResultantPower after combining the two lenses $ P = P_1 + P_2$ $P_1 = \frac{100}{80} = 1.25D, P_2 = \frac{100}{ -50} = -2 D$ $\Rightarrow P = P_1 + P_2 = 1.25 -2 = -0.75D$ |
