Question

HEY GUYS!!!!
A person needs a lens of power-5.5 d for correcting his distant vision he needs lens of power 1.5 d.Find focal length..

Guys answer the problem in a simple way ..;)..

Answer 1

p=1/f

-5.5=1/f

f=5.5*2

10/100

.1meter

2) p=1.5*2 =3

Answer 2

given p =-5.5

p=1/f

f= 1/p

=1/-5.5

=-0.18 m

=-18.18 cm...

which implies a concave lens

now 1/1.5

=0.666m

=66.66 cm...

hope it is helpful..