The other two angles in the triangle are both less than 90 degrees. In a right angle triangle, one of the three angles is at exactly 90 degrees (a "right angle"). "Results Table", and use it to record your results.Īll the calculations necessary for finding the refractive index of a piece of glass depend on the geometric properties of a right angle triangle. (Move your cursor over the "buttons" on the left).įor each measurement, record four values, two for the source light and two for the image Use the illustrations below, to step through the procedure necessary for measuring the angles in the refractometer, and determining the refractive index of the glass. He has also provided you with a light detector, that is used to find where the yellow light leaves the glass block. It is this light that shines at an angle to the surface ot the block of glass, and whose path is bent, allowing you to find the refractive index of the glass sample. The second, yellow sodium light (589 nm), is the source of the light used to make the measurements. He has also given you two lights a blue, reference, light which shines straight through the glass block and shows you the position of the "normal". He has provided you with many different samples of glass blocks the same types of glass used to make the microscope lenses. It has a wavelength of 589 nanometers.īrother Gregory's refractometer is very simple. In all these investigations the yellow light emitted by sodium ions is used. The amount of bending that takes place depends on the nature of the glass and the wavelength of the light being used. As a ray of light passes from air into a block of glass, the direction in which it is travelling is changed.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |