Question

When a convex lens of 12.5 cm focal length is used as a magnifying glass, normal eye can see an object clearly at a distance of 25 cm. The magnifying power of the instrument is ____________.

विकल्प

• 10

• 6

• 2

• 3

Answer 1

When a convex lens of 12.5 cm focal length is used as a magnifying glass, normal eye can see an object clearly at a distance of 25 cm. The magnifying power of the instrument is 3.

Explanation:

M.P = `(D/F + 1)`

= `(25/12.5 + 1)` = (2 + 1) = 3