Question

# An object is placed at 30cm from a convex lens and its real image is formed at 20cm away from the lens. Calculate the focal length of convex lens. Draw ray diagram also.

Open in App
Solution

## Here,Image distance=v=20cm,Object distance=u=−30cm,Lens equation is given by,1v−1u=1f,putting the values we get,120−1−30=1f,∴f=12cm∴ Focal length of convex lens=f=12cm

Suggest Corrections
0
Related Videos
Lens Formula, Magnification and Power of Lens
PHYSICS
Watch in App
Explore more