1, observe the equal thickness interference phenomenon of light and understand the characteristics of interference fringes.

2. Measure the curvature radius of the lens by interference principle.

3. Learn the method of processing experimental data by step-by-step difference method.

Measuring skills of measuring curvature radius by Newton's ring method;

Rotate the micrometer drum to the right (or left) side for more than 18 dark lines, then return to 18, aim the crosshair at the center of 18 dark lines, record the reading, and then measure the centers of 17 and 16 to 3 dark lines in turn.