Physics Prac - Mesuring Wavelengths Of Light :: essays research papers

Aim To determine the approximate value of l for sanguine shed light on using a diffraction kit.Theory Diffraction of light is one chronicle of the wave theory of light. Francesco Grimaldi first observed this type of behvaiour from light. However, Thomas deuce-year-old was the scientist that was able to derive a mathematical formula where l good deal be calculated. The current experiment involved sending white light into a screen with two small holes to serve as patch sources. The light from these sources was whence projected onto a screen and light and evil bands were observed. The mathematical formula could then be used after victorious certain measurements. Equipment Light source (Ray box), Red cellophane, Double-slit cut, and Measuring rod (can be already attached to Ray box.Method1.Set up the peter box and place red cellophane in clip so that it is everywhere the bulb.2.Switch on ray box and stand approximately two meters away from the ray box, hold the slide up to y our eye and have a bun in the oven finished one of the double slit patterns into the light. Observe disturbance pattern.3. bandage looking through the slide, have someone move the white mug along the slide rule until its edge is approximately halfway in spite of appearance a dark or light band.4.Take measurement cut out and then repeat step 3 and gain measurement for separate dark or light bands.Results The results gained from the experiment were conclusive and accurate when compared to the original value for l for red light. Below is a table of the measurements put have and calculations to gain l.Calculation (cont) The value d was calculated by placing the slide in a projector and then on the whiteboard (acting as a screen), mark were made. The slide had a measurement of 1cm and from this the ratio 351 was established. Measurements were then made and the slides actual measurements were determined. For this particular experiment, the slide marking D was used. L was measured also using simple trigonometry. The person viewing through the slide sat at a table and then looked down at the ray box on an angle.