Question

If a person suffering from long-sightedness uses spectacles of power +1 dioptre, then the near point of the person is (a) 20 cm (b) 33.33 cm (c) 35 cm (d) 45 cm​

Answer 1

P= thuD

ونا Es convex → farsighted.

f = 1 = + = 1 ⇒ f = ~=1m = 1000m.

こ V U ÷-1 = V + 100 100 75

3-4 = -1 300 300 V ⇒ v=-300cm.