Question

a convex lens has focal length 2.0 cm find the magnifying power of image is formed by the DDV

Answer 1

DDV stands for distance of distinct vision and it's value in humans is 25 cm

Answer 2

Answer: The magnification power will be 13.5.

Explanation:

Given that,

Focal length f = 2.0 cm

Distance of image is formed by the  DDV that means,

Distance of image v = 25 cm

Using lens's formula of magnification power

$M=1+\dfrac{D}{F}$

$M= 1+\dfrac{25}{2}$

$M = 13.5$

Hence, The magnification power will be 13.5.