Question
An object placed 15 cm in front of a lens forms a real image three times magnified. Where is the image formed? What is the focal length of the lens?
Solution
Given,
Object distance, u = - 15 cm
Image distance, v =?
Focal length, f =?
As magnification is - ve for a real image, so
(given)
Therefore, image distance ,
Also, using the lens formula, we have,
i.e., focal length,
Object distance, u = - 15 cm
Image distance, v =?
Focal length, f =?
As magnification is - ve for a real image, so
(given)
Therefore, image distance ,
Also, using the lens formula, we have,
i.e., focal length,
