Question

the power of a lens is +2D.its focal length will be:(a)100 (b)50(c)25 (d)40.

Answer 1

hello my friend!

we know that power p= 1/f

here +2 = 1/f

f = +1/2 meter
f = + 50 cm

hope it helps
please mark as brainiest if helped

Answer 2

p=1/f
2=100/f
f=100/2
f=50

Answer is (b) 50