Determine focal length of Convex lens of a far distance object std 8 to 12 GBSE.

Focal length of Convex lens

To determine the focal length of a convex lens by obtaining an image of a far distance object. 

AIM  : To determine the focal length of a convex lens by obtaining an  image of a far distance object.

PRINCIPLE   :  Rays parallel to the axis, after being refracted by a convex lens, are focused on the principal focus. Distance between the optical centre and the principal focus is known as the focal length.

APPARATUS   :   Convex lens, Stand, Screen, Foot-rule, Paper, Pencil,

Convex lens to find Focal lens

Observation

Conclusion

Practical uses

Convex lens of proper focal length are usedin optical instruments like simple microscope, compound microscope, telescope, etc,. Also the method given here in the simplest way to estimate the focal length of a convex lens.