Question

a convergent lens of power 8D is combined with a divergent lens of power-10D.Calculate focal length of the combination​

Answer 1

Answer:

Explanation:

Simply by adding powers 10+8=18D we get power of combination and focal length is reciprocal of power(in metres)so it will be 1/18 m

Answer 2

Hey mate,

a convergent lens of power 8D is combined with a divergent lens of power-10D.Calculate focal length of the combination

solution,

Power=8-10=-2D

focal length=(-1/2)=-0.5m