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.
Fill refraction cell with water. 4. Direct laser pointer at Refraction cell so that the light from the laser pointer enters the refraction cell at the reference line. 5. 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.
Then record that value and turn off the laser, and record the distance of the light source from the viewing screen. Then calculate the wavelength of the light source. Part 2: Diffraction Grating Using a diffraction grating to produce an interference pattern, measure the distance of any mth-order maximum from the central maximum. Record the distance of the light source from the viewing screen. Record this value and calculate the diffraction slit distances.
Answer: Take the power of the objectives then multiply them by the power of the eyepiece by 10x. (4 points) |Score | | | 2. Explain how to focus a microscope using the high power lens. Include any safety issues you need to be aware of. Answer: To focus a high power lens you need to turn the knob using the scanning lens after that you need to rotate the high power lens.
The laser system in lasik eye surgery includes a large machine with a microscope attached to it and a computer screen. A drop will be placed in your eye, the area around your eye will be cleaned, and an instrument called a lid speculum will hold your eyelids open. A ring will be placed on your eye and very high pressures will be applied to create suction to the cornea. Your vision will dim while the suction ring is on and you may feel the pressure and experience some discomfort during this part of Lasik eye surgery procedure. The microkeratome, a cutting instrument, is attached to the suction ring.
The pupil is an aperture which is at the centre of the iris and lets the light enters the eye lens. In order to adjust the intensity of light, the pupil can increase or decrease in diameter. The eye lens is attached to the ciliary muscle by ligaments and controls the curvature of the lens. Light passing through the lens then enters a second chamber called the vitreous humour which is a jelly like substance. The light reaches the back surface of the eye, the retina.
Principles of Microscopy and Histology 1. Overview of the microscope and how it functions * Word count: 216 a. Bright field microscopy utilizes an illumination technique where light is transmitted through the specimen (Pattabhi & Gautham 2002, pp. 82). The image is formed by the contrast of the interaction between the differential absorption and diffraction of the light by the specimen (Estridge & Reynolds, p. 147; Goldstein 1999, p. 71).
By finding the reflection, we were then able to find the object and image and their distances. In part one of the experiment, we used a flat mirror to draw our rays of reflection and incidence. We determined the angle measure, and then the distances of the image and object. In part two, we used a glass block to measure refraction. We pinpointed the rays and determined the angles of incidence and refraction.
This is found on the lens of your camera, and it will be the ring that is the closest to the camera. This ring controls how much light is let in to the camera. The numbers on the aperture ring are 22, 16, 11, 8, 5.6, 4, 2.8, and 1.7. The only thing you need to know here is that the higher the number, the more light will be let in to the camera. The next thing you need to know is how to work your shutter speed dial.
The retina is then broken down to four light receptors, consisting of rods and cones. The eye also consists of accessory structures such as, eyelashes and eyelids. It is important to also understand the difference between farsightedness and nearsightedness and ways in which they can be corrected. The eye consists of three layers. The toughest and outermost layer (fibrous tunic), the sclera, creates the “white” of the eye.