to determine wavelength of light by newtons ring experiment full experiment
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If we place a plano convex lens L on a flat glass plate G as
shown in the figure, an air film of varying thickness is formed
between the curved surface of the lens and the flat surface of the
plate. Light from a Sodium lamp S falls on a flat glass plate P
placed at 45◦ with respect to the incident beam. Some of this
light is reflected at the plate and directed towards the lens and
glass plate placed below. This light in turn is partially reflected
upwards at all the four surfaces. Light reflected from the curved
surface of the lens and light reflected from the adjacent surface
of the glass plate then interferes to form a pattern of circular
fringes.
Consider points lying close to the point of contact between
the lens and the glass plate. We note that the path difference
between the interfering beams is approximately 2t, where t is
shown in the figure, an air film of varying thickness is formed
between the curved surface of the lens and the flat surface of the
plate. Light from a Sodium lamp S falls on a flat glass plate P
placed at 45◦ with respect to the incident beam. Some of this
light is reflected at the plate and directed towards the lens and
glass plate placed below. This light in turn is partially reflected
upwards at all the four surfaces. Light reflected from the curved
surface of the lens and light reflected from the adjacent surface
of the glass plate then interferes to form a pattern of circular
fringes.
Consider points lying close to the point of contact between
the lens and the glass plate. We note that the path difference
between the interfering beams is approximately 2t, where t is
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