Question

Two lenes of power +2d and -1.5 d are placed in contact. Find the focal legth of combination

Answer 1

l1=2D
l2=-1.5 D
total power = 2+(-1.5)
= 2-1.5
= 1.5D
f of combinations =
p=1/f(in metres)
1.5=1/f
f=1/1.5
f=o.66m


thnxx
Hope it helps you
Please mark the answer as Brainliest.