Question

near point of eye is 50 cm . find nature and power of lens which would enable him to read a book placed at 25 cm from his eyes.

Answer 1

the mirror should be convex in nature
u=-25cm
v=-50 cm
1/f=1/v-1/u
1/f = -1/50 +1/25
1/f=  1/50
f=50cm = 0.5m
p=1/f
 =1/0.5
  2D