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The focal length of a convex lens.

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  • Essay length: 1657 words
  • Submitted: 13/01/2005
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AS and A Level Microscopes & Lenses

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Physics Full Laboratory Report (3)

Title:

The focal length of a convex lens.

Aim:

*To learn the technique of locating real image by no-parallax method.

*To study the real image formed by a convex lens.

*To determine the focal length of a convex lens by graphical method.

*To determine the focal length of a convex lens by conjugate foci method.

Apparatus:

1 convex lens on a holder (with focal length not greater than 15 cm)

1 1-meter ruler,

1 translucent screen,

1 plane mirror,

1 optical pin on a cork,

1 illuminated object (a lamp house with a letter 'F' on it)

For further investigation:

1 more convex lens of the same focal length as above.

Principles:

A convex lens (converging lens) is a circular glass plate convex on both surfaces. The non-uniform thickness causes bending of light towards the principle axis. In particular, a convex lens converges light from infinity parallel to the principal axis to a point, called the focus (F). Light rays from infinity not parallel to the principal axis are converged

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