Question

Find the focal length of spectacles of a person whose least distance of vision is 50cm

Answer 1

Answer:

Step-by-step explanation:

u = -25

v = -50

1/f=1/v-1/u

1/f =1/-50 -1/-25

solving we get f=50cm

Answer 2

U= -25

v=-50

the formula is

1/f=1/v-1/u

1/f=1/-25-1/-50

by solving this

we get f =50