I then placed the ray box allowing the light ray travels along the 10° then marked the refracted light on the glass. 6. And then repeated step 5 with 20°, 30°, 40°, 50° and 60°. 7. After that, I drew rays from the marks of the refracted light on the glass to the center.
By measuring the angles of diffraction and by calculating the grating spacing, the wavelength of the light may be calculated. The light source used in the experiment should be a monochromatic light source as the experiment requires light of a single wavelength in order for the wavelength to be calculated. The second part of the experiment demonstrates how to determine the measurement of the groove spacing of a CD. The CD is used as a reflective grating; the light is reflected from the surface of the cd some of the reflected angles will give rise to constructive maxima, similar to a diffraction grating. The last part of the experiment is to determine the measurement of the diameter of powder spores by passing a monochromatic light source through a circular aperture and producing a diffraction pattern of concentric rings.
Experiment on finding the Refractive Index value of Perspex using Snell’s law Aim: The aim of this experiment is to find the refractive index of Perspex, using Snell’s law. By shining a ray at a prism and drawing the incoming and out coming ray, and then drawing the normal and measuring the angles. Variables: Table 1: table of variables Identify the variable(s) How will the variable(s) be changed, measured, and/or controlled? Independent variable(s) Angle of incidence Move the box around so that the ray hits the prism at different angle. Dependent variable(s) Angle of refraction Measure the angle with a protractor.
We rotated the ray table clockwise by increments of 10̊ again. We repeated the same measurements but instead with counterclockwise angles. From the two angles of refraction we were able to calculate the average angles of refraction. Finally, we aligned the flat side of the lens so that incoming light ray struck the cylindrical surface. We rotated the ray table until the refracted ray disappeared completely and only the reflected ray was visible.
We can now explore the more complicated scenario of light traveling from one medium to another. Below is a diagram showing the path that the light travels. Here we know that the light is traveling from the initial point to the final but we are trying to find the x value (where it crosses the two mediums) that minimizes the time taken. If we look at this diagram it is clear that in general the total time that the beam travels to get from point x1,y1to point x2,y2 is: Tx=x-x12+y12v1+x2-x2+y12v2 If we consider Fermat’s principle of least time to be true then the true time taken is that for which the function is a minimum. To find this we take the derivative of T(x) and set it equal to zero.
Place a dot on the piece of paper at the point where the laser light originates from the pointer and where it leaves the refraction cell after passing through the water. 6. Use a ruler to draw a line from the points placed on the paper to the point where the parallel lines intersect. 7. Use a protractor to measure the angle from the reference line to the lines drawn in step 6.
Your eyes trace the light rays backwards as straight lines to the point they would have come from if they had not changed direction and as a result you see the tip of the straw as being shallower in the liquid than it really is. Figure 1: Due to refraction, a straw in a glass of water appears bent when an observer looks down at an angle from above the water surface. Refractive index The speed of light and therefore the degree of bending of the light depends on the refractive index
An experiment investigating the Stroop effect on color-related words. 1/2 The stroop effect interference is defined as the difference in time to name the ink colors of printed color words compared to neutral color words. This experiment aimed to verify if the stroop effect interference still occurred when a variation was introduced and color-related words were used instead of color words. Participants were given one list of color-related words written in incongruent ink colors and another list of color neutral words. Participants were then asked to name the ink color and their response times for each list were measured in seconds.
Suggest two reasons for this change. Task 2 Press back but not clear and change the number of chips to 10 but leave the acid concentration at 1.0 mol/dm3 . Click start and take readings approximately every 3 seconds (by clicking the take readings button) until the mass reaches 0.0 g. Stop the reaction immediately. Plot these results on the same grid as the results of your first experiment. How does the rate of reaction in Task 2 compare with the rate in Task 1?
Edward Gray NT1310 07/29/2013 Assignment 7 Reflection, Refraction and Degradation. The law of reflection states that if light hits a reflective surface at a certain angle, (angle of incidence), it will reflect or bounce off at the same angle, (angle of reflection.) A Mirror is a good example of reflection. Mirrors have smooth shiny surfaces that absorb very little light, so they reflect light in almost exactly the same pattern as it hits, which allows us to see a complete reflected image of objects. Mirrors can reflect images of objects because light rays bounce off an object, travel in a straight line to a mirror, bounce off the mirror, and then travel to the eye of an observer.