A convex lens forms a real image on a screen when object is placed at 10 cm from the screen. on shifting the lens by 2cm, a real image is again formed on the screen. find the focal length ​
A convex lens forms a real image on a screen when object is placed at 10 cm from the screen. on shifting the lens by 2cm, a real image is again formed on the screen. find the focal length ​
Answers (1)
Using the formula of finding focal length using the displacement method.
i.e
where
f=focal length
displacement of lens done in order to get the image again on screen.
D=distance between object and screen.