Question

A lens has a power +2.0



d.The type and focal length of this lens is

Answer 1

for +2.0 the lend used is convex lens with least distant vision

Answer 2

Power, P = +2.0 D
Focal Length, f = ?

We know,
Power = 1 / Focal Length (in metres)
=> P = 1 / f ( in metres)
=> f = 1 / P
=> f = 1 / 2
=> f = +0.5 m

Since the focal length is positive, the lens is Convex.