Question

2 calculate the power of concave
sene whose focal length is o.25 m​

Answer 1

Answer:

- 4 D

Step-by-step explanation:

f = - 0.25 m ( focal length of concave lens is negative)

P = 1/f

= - 1/0.25m

= - 4 D

Answer 2

Step-by-step explanation:

What is the power of a concave lens of focal length 25cm ? Solution : Here, P=? f=-25cm As P=100f,f=100-25=-4dioptre