They are produced when the light is reflected between two surfaces - a spherical surface and an adjacent flat surface. In the resultant interference pattern, areas of same brightness are determined by the difference of phases of waves, thickness of the medium material traversed e. These are points that are equidistant from the point of contact of the two surfaces, i.
Need a fast expert's response? Place free inquiry. Calculate the price. Learn more about our help with Assignments: Optics. Comments Assignment Expert. Your comments have been successfully added. However, they need to be checked by the moderator before being published. Choose subject Choose category Related Questions 1. I need to test the resolution of a laser diode imaging system.
According to modeling, the resolutio 4. What is the frequency difference of GHz equivalent to at the nm wavelength of Gallium arsenid 5. What is the average energy in each p 6. MST-I Result. Exam Schedule. MST-I Nov Amita Mourya. Engineering Physics by Dr. Amita Maurya, Peoples University, Bhopal. Formation of fringes When a plano-convex lens with large radius of curvature is placed on a plane glass plate such that its curved surface faces the glass plate, a wedge air film of gradually increasing thickness is formed between the lens and the glass plate.
The thickness of the air film is zero at the point of contact and gradually increases away from the point of contact. If monoc hromatic l ight is allowed to fall normally on the lens from a source 'S', then two reflected rays R 1 reflected from upper surface of the film and R 2 reflected from lower surface of the air film interfere to produce circular interference pattern.
This interference pattern has concentric alternate bright and dar k rings around the point of contact. Theory of Fringes: The effective path difference between the two reflected rays R 1 and R 2 for a wedge shaped film from equation 2. Substitute t from eq. The diameter of n th order dark fringe will be …. The diameter of dark ring is proportional to square root of natural numbers Diameter of Bright Rings Substitute t from eq.
The diameter of n th order bright fringe will be …. Amita Mourya Contact.
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