Question

When a convex lens of power +20D is held in contact with a concave lens of power -40D then
the power of the combination is
​

Answer 1

P=P1+P2=+2-1=+1D,lens behaves as convergent.

F=1/P=1/1=1m=100cm(ans.)

hope it helps..

Answer 2

Answer:

100

bhai plz .. brainliest mark krr de sirf 2 he bache hai.....

---------- BM'S W