Reflection and refraction lab. Reflection and Refraction Lab Essay 2019-03-01
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Law of Reflection Lab
The pencil was placed in a slanted position because refraction cannot occur if the angle of incidence is zero degrees. This will be the path of the light ray inside the prism. Does the refracted angle remain the same for different angles of incidence? In the diagram above, a light ray strikes the mirror at a specific point, and the reflected ray is projected. This law will be discussed in more detail in. Has the ray been refracted towards or away from the normal when going form air to perspex? Place a pin A about 3 inches in front and toward one side of the mirror. When this light passes through raindrops, the shorter wavelengths are bent more than the longer ones, splitting the light into its different colors. What do you notice about the angles of the reflected and refracted light? This is the direction of the incident ray.
Sighting past A and through the prism, place another pin B about three inches from the opposite side of the prism where you can see it and line it up with A. An object placed beyond the curvature of a mirror will cast an inverted, shrunken, real image. Describe your observations of the intensity of the beam emanating from boundary 2 as you rotate the prism. This reflection aims to evaluate the importance of learning through experience. This is depicted in the diagram below. These pictures are attached to this write-up. Diffraction is observed of light waves but only when the waves encounter obstacles with extremely small wavelengths such as particles suspended in our atmosphere.
After that, use a ruler to draw a line to coincide with the path of the emerging light beam. In the case of the concave mirror, the focal point was in front of the mirror. The same waves however are unable to diffract around larger boats since their wavelength is smaller than the boat. We also saw that light bends when moving from one medium to another - this is refraction. The laser is more stable after it has warmed up for a few minutes, so keep it turned on until you complete your experiment.
Light bounces in a particular way, and it bends in a particular way. The separation distance between the two reflected rays will depend on the thickness of the slab t and the angle of incidence. Light bounces in a particular way, and it bends in a particular way. Prisms are sometimes used for the internal reflection at the surfaces rather than for dispersion. Make sure it is straight upright. Some uncertainties that see probable in the case of general human error are the basic visualization of the location of the pin, the measuring of the angles with a protractor, the possibly imprecise way to draw the reflected and incident rays and a general error in calculation. This effect is due to the changes in wave height along the.
The law of reflection states that the angle of reflection and angle of incidence are equal, with each angle being measured from the normal to the boundary: Refraction is defined as the bending of light that takes place at a boundary between two materials having different indices of refraction due to a change in the speed of light as it passes from one medium to another. Instead of refracting, the ray of light reflects. For an example of this, imagine you are outside looking at a restaurant window. Observe the direction of the transmitted beam inside the block and the emerging beam at the block-air boundary. This generally produces a magnifying effect, such as that seen in a makeup mirror.
Generally, the incident ray is partially reflected and refracted. To make this easier you can hold your right hand behind the cross, this way you don't have to run it along the paper surface - you can see the laser dot on your hand. Also, it has aided in the understanding on what makes the. Case 2 shares the same characteristics of case 1. Rather, a wave will undergo certain behaviors when it encounters the end of the medium. Try to keep the mirror line from moving during the experiment. The pencil appeared slant as shown in Fig 2 because the light rays bend as they pass from air into water.
When light is shone off a spherical mirror, it will converge at a focal point. Refraction is where light bends when it moves from one medium to another. Figure 5 : Optic bench Description of Apparatus: Angular Translator The angular translator is used to align optical components to within one degree. Compare your obtained value of f with the nominal value of 5 cm: Are they consistent? The graph of the plotted angles of incidence against the angles of refraction is not a straight line and therefore demonstrates this. The straight lines of sight interpreted by the eye intersect at a position that is higher than the actual origin the rays. When traveling from deep water to shallow water, the waves are seen to bend in such a manner that they seem to be traveling more perpendicular to the surface.
Once the refractive index of a certain medium is known, the angle of refraction can be calculated if the angle of incidence and known and vice versa. The direction that these wavefronts straight-line crests are traveling through the water is represented by the blue arrow. It was not stated in the lab manual how to take that angle into consideration, and thus those values should most likely be thrown out. The angle of incidence formed by the ray of light travelling though air into a slab of rectangular perspex is not directly proportional to the angle of refraction angle formed between the ray travelling though perspex and the normal. Parallel rays entering a convex lens converge on a point on the other side of the lens.
