Question

At what distance should an object be placed from a lens of focal length 25 cm to obtain its image on a screen placed on the other side at a distance of 50 cm from the lens? What will be the magnification produced in this case?

Answer 1

 Given that, Focal length, f = 25 cm Image distance, v = 50 cm Form the lens formula, Or, u = −50 cm Magnification, The object must be placed 50 cm away from the lens, on the other side to produce a magnification of −1.

Answer 2

Answer:

it will be -1

Explanation:

f=25cm v=50cm u=-50cm so the distance of image will be 50cm away and the magnification will be -1