Find the power of a concave lens of focal length 2 m.
The focal length of a concave lens is considered negative and hence written with a minus sign. So, focal length of concave lens, f = -2 m
Now, Power, P = 
Or P = 
Thus, Power, P = -0.5D
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Find the power of a concave lens of focal length 2 m.
The focal length of a concave lens is considered negative and hence written with a minus sign. So, focal length of concave lens, f = -2 m
Now, Power, P =
Or P =
Thus, Power, P = -0.5D