Question

The combination of a convex lens of power + 2 D and a concave lens of power –2D, acts as a __________​

Answer 1

P

1

=+5D,P

2

=−7.5D

(a) Power of combination:

P=P

1

+P

2

=+5D+(−7.5D)=−2.5D

(b) Focal length of the combination:

f=

P

1

=

−2.5

1

=−0.4m=−40cm

Answer 2

Answer:

thanks for following and thanks for thanks also