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Focal length of Concave and Convex lens

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  • Essay length: 786 words
  • Submitted: 06/11/2009
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The first 200 words of this essay...

Focal length of Concave and Convex lens

Objective

In this experiment, we are going to use three different methods and one method to find the focal length of an unknown-focal length of convex lens and concave lens.

Apparatus

2 meter rules, a light box, a white-coloured screen, a D.C. power supply, 2 lens holders, a plane mirror, a transparent object F, two-unknown focal length of convex and concave lens.

Theory

Since the convex and concave lenses are made of glasses, the focal lengths are actually the convergent point of all refracted light sources. So, the main theory that we are applying is the refraction theory and also the Lensmaker's equation.

is an equation which shows the relationship between the focal length with the object and image distances. With mathematical simplification, the Lensmaker's equation can be applied as follow .

Procedure

Type A is a convex lens with shorter diameter

B is a convex lens with longer diameter

METHOD I,

We put the lens in front of the window and then try to obtain a sharp image on the screen.

When we get

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