Newtons rings 38 discussion i the newton s ring experiment can be also used to find the wavelength of a monochromatic light. In transmitted light the ring system is exactly complementary to the reflected ring system so that the centre spot is bright. The experimental setup used for the experiment is shown in fig. By employing sodium light whose mean wavelength is 5893a, r can. The wavelength of monochromatic light can be determined as. Please al so answer the post lab questions about this experiment. To determine the wavelength of sodium light using newtons. Newtons rings is an interference pattern caused by the reflection of light between two surfaces a spherical surface and an adjacent flat surface. The rings are caused by interference of light waves. Calendar events for the user\, jayne germany begin. When a planoconvex lens l of long focal length is placed on a plane glass plate g, a thin.
Pdf in this paper a method has been illustrated to determine wavelength of sodium light in the comprehensive way by an author. A video of the entire experiment will work as well. In this case, the radius of curvature of the convex surface of the given lens is supplied or is determined otherwise. To determine the wavelength of sodium light by newtons ring. Condition for formation of bright and dark fringes. Experiment 4 to determine the wavelength of monochromatic light sodium light by newton s ring experiment 5 to determine the wavelength of sodium light source using plane transmission grating experiment 6 to verify inverse square law of light using a photo cell. Isaac newton a 17th century scientist put forth a variety of laws that explain why objects move or. The thickness of air film varies from zero at the point of contact to some value t at point p. When viewed with monochromatic light, newton s rings appear as a series of. To determine the wavelength of sodium light using newton s rings table 8. Pdf analytical study of newtonss rings concept to determine the. Sample data table ring number lm j lm l1j rm j rm r1j dm 24 23 22 1 spherometer a spherometer is used to.
In this unit newton s laws of motion, the ways in which motion can be explained will be discussed. To determine the wavelength of sodium light by newtons ring method. Newtons rings is a phenomenon in which an interference pattern is created by the reflection of. Ring shaped fringes are produced by the air film existing between a convex surface of a long focus planoconvex lens and a plane of glass plate. In this unit newtons laws of motion, the ways in which motion can be explained will be discussed. Interference topics introduction, interference in thin films due to reflected light interference in wedge shaped film, light, film newton newton ss rings rings, michelson s interferometer, applications. The occurrence of the newton s rings can be explained on the basis of wave theory of light an air film of varying thickness is formed between the lens and the glass of sheet when a light ray is incident on the upper surface of the lens, it is reflected as well as refracted. Tracker is freely downloadable from the net and can be employed for experiments by anyone. As a result, we have the deviation of i from its theoretical value of 0. There are severa l free online resources where you can find performances\, or tutorials to reflect upon. When a parallel beam of monochromatic light is incident normally on a combination. To find the diameter of a wire, to find the wavelength g of light g and refractive index of liquids and thin transparent sheets, flatness of surface, thickness of thinfilm.
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