Question

*The focal length of a lens of power -2.5 D is: *

Answer 1

Answer:

-0.4m

Explanation:

f= 1/D

f= 1/-2.5

f= -0.4

...the focal length of lens is -0.4m.

hope this helps you....

please please mark me as a brainliest.....

Answer 2

Answer:

first 1/Focal length [in meters] = power

power is -2.5

and 1/F is -2.5

F is 1/-2.5

=-0.4 meters

Explanation: