Question

If the power of a lens is -2 D. What is its focal length?

-50 cm

+ 50 cm

-100 cm

+ 100 cm​

Answer 1

Answer:

-50 is the answer... hope it is useful for all

Answer 2

Answer:

power=1/(focal length)(in m)

focal length =1/power

focal length=1/(-2)m

focal length= -0.5m

focal length= -50cm