Question

If the power of a lens is – 2 D, what is its focal length?
(a) +50 cm
(b) -100 cm
(c) -50 cm
(d) +100 cm fast answers

Answer 1

Answer:

Option C

Step-by-step explanation:

Power of lens = 1/Focal length (in meters)

Therefore,

If the power of the lens is - 2 D then focal length of the lens will be - 1/2 m = - 50 cm

Answer 2

Answer:

c) -50cm

Step-by-step explanation:

P=1/f

-2=1/f(in m)

-2=(1/f)*100. cm

f=100/-2

=-50cm