Question

Calculate the distance of object from a convex lens having a focal length of 15cm if the magnification is 3 and the image is real . i mark brilliant

Answer 1

Answer:

we know that m= v/u

v= mu

1/f = 1/u + 1/v

1/f = 1/u + 1/3u

f= 3u/4

60 = 3u

u = 20 cm.

Explanation:

Answer 2

Answer:

20 is answer

hope it helps you