Question

find the focal length of a combination lens of +0.5D and -2.5D it is converging or diverging​

Answer 1

Answer:

Resultant power,p=p1+p2

p=0.5D-2.5D

p=-2D

focal length,f=1/p

f=-1/2=-0.5m=-50cm

The lens are concave lens and they are diverging lens.....

Explanation:

Hope it helps you....