Purpose: To demonstrate the formation of images by a concave mirror and a converging lens.

Use the burning candle as an object and mount the mirror or lens so as to to produce an image on the ground glass. Orient the apparatus so that the class views the ground glass from the side opposite the light source. Illustrate the effect of varying the object distance. Remove the ground glass and adjust the object distance to project the image onto the classroom wall.

Compare the relative distances with those predicted by the lens/mirror equation or ray diagrams.

Formulas for Mirrors

Formulas for Lenses

References: