Question

If FOCAL LENGTH IS 0.2 THEN FIND P(D) PLZ DO FAST AND GIVE FORMULA ALSO

Answer 1

f=0.2
p=1/f
p=1/0.2
p=10/2
p=5 D
power of lens is 5 dioptre

Answer 2

POWER IS INVERSALY PROPORTIONAL TO FOCAL LENGTH.
THEREFORE 1/0.2=5Dioptre