This detection is carried out by photoreceptors within the human eyes. The photoreceptors consist of cones, which are responsible for colour recognition, and rods which are responsible for detecting contract between light and dark. When the electromagnetic energy hit these photoreceptors, this is relayed back to the brain which converts this energy into the images that are perceived by human being. The eyes of have many different properties and seven of them will be tested and verified in this laboratory with seven different experiments. These experiments are as follows, the convergence of gaze, accommodation of the sight, blind spot of the eye, mechanical stimulation of the photoreceptors, positive afterimage, negative afterimage and finally visualizing retinal blood vessels.
Later, when I turned the brain over, the most prominent structure visible was the optical chiasma, where two optic nerves cross over each other. Towards the front of the brain the two olfactory bulbs were easily identifiable. Under the optic chiasma were bulges that indicated the pons and a long stem like structure that was the medulla oblongata. I made 2 cuts altogether
------------------------------------------------- University of Phoenix Material Neurological Structures and Functions Worksheet Short-Answer Essays 1. Describe why humans have a blind spot. 2. Because the nerves that leave the back of the eye which is the blind spot has no receptors. 3.
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. Refraction, the bending of light rays, occurs when light travels from one transparent substance to another. If you place a large bottle of water in front of a newsprint it makes the letters appear wider and larger, because it bends the light inward, making it appear to the eye that the light rays are coming from much wider print. Convex lenses are used in movie and slide projectors, and in eyeglasses for far-sighted people. A concave lens “caves in’ in the middle, so it is thin in the middle and thick on the outer edges.
Investigating the various phenomena which occur when monochromatic light undergoes diffraction Title: Determine the wavelength of a monochromatic light source (laser). Measure the groove spacing of a CD and the diameter of powder spores using diffractive methods. Aim: The aims of this experiment are to determine the wavelength of the monochromatic light source and to determine the groove spacing of a CD and the diameter of the Lycopodium powder. Introduction: There are three parts to this experiment in the first part a diffraction grating is used to diffract light from a laser (monochromatic source of light). By measuring the angles of diffraction and by calculating the grating spacing, the wavelength of the light may be calculated.
When looking at an object a wavelength enter into the eye and pass through the cornea. The cornea is a clear membrane that cover the front of the eye, and help direct incoming light. The eye is build up on selera which is tissue that covers the eye ball except the cornea. Visual information is then sent to the brain and process in the retina by neurons called ganglion cells. There are only one million ganglion cells that transmits messages from 130 million visual receptors.
The purpose of this lab was to use a spectroscope to analyze the light produced by different light sources. We looked at six different light sources through the spectroscope, including incandescent light, helium, neon, mercury, nitrogen, and fluorescent light. When viewing these light sources through the spectroscope we could see different types of spectra. Spectrum is a band of colors, as seen in a rainbow, produced by separation of the components of light. The different types of spectra are continuum spectrum, absorption spectrum, and emission spectrum.
After that, I drew rays from the marks of the refracted light on the glass to the center. 8. Lastly measured and recorded the angles of refracted light
What is color? Color is the byproduct of the spectrum of light, as it is reflected or absorbed, as received by the human eye and processed by the human brain. Color is the visual perceptual property corresponding in humans to the categories called red, yellow, blue, black, etc. Color derives from the spectrum of light interacting in the eye with the spectral sensitivities of the light receptors. Color is a language.
SENSATION Sensation is defined as the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment. The study of sensation is concerned with the initial contact between organisms and their physical environment. It focuses on describing the relationship between various forms of sensory stimulation (including electromagnetic, sound waves, pressure) and how these inputs are registered by our sense organs (eyes, ears, nose, tongue and skin). The process through which the senses pick up visual, auditory, and other sensory stimuli and transmit them to the brain; sensory information that has registered in the brain but has not been interpreted. Sensation is the process by which our senses gather information and send it to the brain.