Question

A convex and concave lens focal length 50 cm and40 cm are combined tohether what is the power of the combination​

Answer 1

Answer:

Hope It's Help u.,..

Explanation:

focal length for concave lens= -40 cm

focal length for convex lens = 50 cm

and, we know that the power will be

= 1/-40+1/50=1/50-1/40=4-5/200=-1/200

Hence ,the power after combination is 200 D(diapter).