3.19 describe an experiment to determine the refractive index of glass, using a glass block

3.19 describe an experiment to determine the refractive index of glass, using a glass block

Experiment: To determine the refractive index of glass, using a glass block.

1. Put the glass block on an wooden table which is passed by a white sheet.
2. The border of the block is marked by a pencil.
3. At one border draw a normal and draw three lines to use as incident ray.
4. Set a ray box through anyone of the lines.
5. The ray travels and passes through the glass block and finally emerges from the glass block.
6. The passage of the ray is marked by putting some pins.
7. Now move the glass block and gain the footprints of the pins to show the passage of the ray.
8. Now using a protractor measure the ∠i and ∠r.
9. Now using, = sin i/sin r ; calculate refractive index.

Ways to improve result:

1. Repeat the experiment, and find the average reading.
2. Plot a graph of sin I against sin r and find the gradient.
3. Vary the value of i and repeat.