A convex lens of focal length 40cm is in contact with a concave lens of focal length 25cm . Calculate the power combination ?

1 Answer

-0.0150.015

Explanation:

Power is

P = 1/fP=1f

The power of combination of the lenses = P_1 + P_2 + P_3 +....

= 1/(f_1) + 1/(f_2) + 1/(f_3) +......

Therefore

P = 1/40 + (-1/25)

= 1/40 - 1/25

=-0.015