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When a Plano-convex lens of large radius of curvature is placed on a glass plate with its convex surface, a thin air film of gradually increasing thickness is formed between the upper surface of glass plate and the lower surface of the Plano convex lens. When this system is viewed in reflected monochromatic light, then alternate bright and dark concentric rings with their dark centre and formed. These fringes are circular in shape because the air film is symmetrical about the point of contact of lens with the plane glass plate. These rings are known as Newton's rings.
These rings are formed because of the interference between the wave reflected from top and bottom surface of an air film formed between the lens and glass plate.
S is broad source of monochromatic light placed at the focus of lens L1. The light rays emitted from source S are made parallel by lens L1. These emitted light rays are incident on glass plate G1 inclined at 45°, rays and rays reflected from this plate falls normally on the system. (Convex lens and plate). Interference occurs between the rays reflected from upper and lower surface of the film. The interference fringes are viewed by a microscope.
Matter, particle and body: Matter is anything which occupies space, possesses mass provides resistance to any stress, example Iron, air, stone, Water. A body of negligible
The first stage of design assumes: budget is approved, marketing research is complete, product can be made at a price below that which it can be sold, research and development is c
Objectives After studying this section, you should be capable to: known properties that are essential to be present in a material for high temperature applications,
A machine of mass one tonne is acted upon by an external force of 3000 N at a frequency of 1500 rpm. To reduce the effects of vibration, isolator of rubber having a static deflecti
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Properties of Some Fibres
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Auto frottage is the method of
The tapered, two-cell beam is subjected to a pure torque of 50,000 in-lb counter clockwise. The length of the beam (normal to the figure) is 100 in. The flange areas are 1 sq in an
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