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Experiment no. 9 Aim: - To find the focal length of a given convex lens. Apparatus: - Convex lens Metre rule Screen Candle Matches Wooden blocks Theory:- In this experiment the focal length of a lens is found out. The focal lens of a lens is the distance from the principal focus to the optical centre. It is the point where the image comes into focus when seen though the lens. The focal length of a lens depends on the curvature of each surface. So the more highly curved the surface, the shorter is the focal length and visa-versa. In this experiment the lens is first placed at L1, between the screen and the illuminated object. When the illuminated object comes in focus on the screen the distance of L1 from the illuminated object is recorded. Then the lens is place at a position L2 where the object again comes into focus on the...

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