Question

please answer my question
One who will help me
*I will mark his answer as brainliest
* I will give you 10 points
But friends no spam
And answer more and more questions
*I WILL FOLLOW YOU

Answer 1

1).

P1=3.5

P2=-2.5

total power=P1+P2

P=1D

focal length ,f=1/P

f=1/1=1m.

2).

P=1/f

f=-25cm.

P=1m/-25=100cm/-25

P=-4D.

3).

P=2.5

f=1/P=1/2.5=0.4m=40cm.

i don't know 4th and 5th questions..

hope it helps...