Question

hey frnds
plzz help me to do this question plz

its very urgent,

Answer 1

For distant vision :

Power = -5.5 dioptre

Focal length (in m) = 1/power

Focal length = -1/5.5 m

Focal length = -100/5.5 cm

Focal length = 18.18 cm

-ve sign show lens is concave.

For near vision :

Power = +1.5 dioptre

Focal length = 100/ 1.5 cm

Focal length = + 66.67 cm

+ve sign shows convex lens.