If a convex lens of focal length 100 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power

Question

If a convex lens of focal length 100 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power (A) + 6.5 D (B) - 6.5 D (C) + 7.5 D (D) - 1 D

Tardigrade Admin · Accepted Answer

P=P1+P2 P=(1/(+1))+(1/(-0.5)) P=-1 D

Q. If a convex lens of focal length $100 c m$ and a concave lens of focal length $50 c m$ are combined together, what will be their resulting power

+ 6.5 D

- 6.5 D

+ 7.5 D

- 1 D

$P = P_{1} + P_{2}$
$P = \frac{1}{( + 1 )} + \frac{1}{( - 0.5 )}$
$P = - 1 D$

Q. If a convex lens of focal length 100cm and a concave lens of focal length 50cm are combined together, what will be their resulting power