Question

if the power of a lens is 4D so it's focal length is........................m ?
1. 0.25 m
2. 2.5 m
3. 25m
4. 4 m​

Answer 1

Answer:

answer is 1

Explanation:

p=1/f

f=1/p

f=1/4

f=0.25m

please mark it as branliest

Answer 2

• answer will be first opt
• focal length is inversely proportional to power of lense
• there fore

1/power of lense = focal length

• 1/4=0.25m