What do you understand by spatial and temporal coherence?
Spatial and temporal coherence are fundamental concepts in the field of wave optics that describe the behavior of light waves and their interactions.
Spatial coherence refers to the degree of correlation between the phases of light waves at different points in _________ _____ ______ _________ _____ __________.
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How is holography different from ordinary photography?
What do you understand by spatial and temporal coherence?
i) Distinguish between fringes of equal inclination and fringes of equal thickness.
Derive an expression for the displacement of the nth bright fringe in Young’s double-slit experiment when a thin transparent plate of refractive index µ and thickness t is introduced in the path of one of the constituent interfering beams of light. Will there be any change in the fringe-width after the introduction of the plate?
The electric field vectors of two light waves propagating along the positive z- direction are given as
where and
are unit vectors along x and y-axes, respectively. Show that when these two waves superpose, we obtain elliptically polarised light. Also show that the linear and circular polarisations are special cases of elliptical polarisation.
In the Fraunhofer diffraction pattern due to a single slit, the intensity of the central spot is maximum. Explain on the basis of geometrical considerations.
ii) Newton’s rings are formed in reflected light of wavelength 5890 10-8cm with a liquid between the plane and curved surfaces. The diameter of the fifth ring is 0.3 cm and the radius of curvature of the curved surface is 100 cm. Calculate the refractive index of the liquid, when the ring is bright.