Physics 2 Lab Report 7 (Focal Length of Lenses) - Focal Length of Lenses Daniel [email protected] Physics Lab 002-05 Richard Johnson Yakntoro Udoumoh

Physics 2 Lab Report 7 (Focal Length of Lenses) - Focal...

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Focal Length of Lenses Daniel Stokes @02723030 3/31/15 Physics Lab 002-05 Richard Johnson Yakntoro Udoumoh
Objective To measure the focal length of convex (positive or convergent) lenses and concave (negative or divergent) lenses. Theory A lens is a transparent object with two refracting surfaces whose central axes coincide. Diverging lenses are concave lenses where the rays diverge. Converging lenses are convex lenses that converge to the central axis. For the lenses the real image forms on the opposite side of the lens while the virtual image is on the same side as the object. Diverging lenses do not form real images. If we have an object distance of d , and an image distance of I , then the focal length f is related by the formula below: 1 f = 1 d + 1 i Apparatus Optical bench, lens holders, screen, lamp, convex lenses, and concave lenses. Procedure Convex Lens 1. Place the lamp and screen on the optical bench about 40 cm apart.

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