If the earth receives 2 cal/min-cm2 solar energy from sun, calculate the amplitudes of electric and magnetic field of radiation?

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If the earth receives 2 cal/min-cm2 solar energy from sun, calculate the amplitudes of electric and magnetic field of radiation?

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A step index fiber has core refractive index 1.466, cladding refractive index 1.46. If the operating wavelength of the rays is 0.85 μm, calculate the cutoff parameter or normalized frequency and the number of modes which the fiber will support. The diameter of core is 50 μm.

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The refractive indices of core and cladding materials of a step index fibre are 1.48 and 1.45, respectively. Calculate: (i) numerical aperture, (ii) acceptance angle, and (iii) the critical angle at the core-cladding interface and (iv) fractional refractive indices change.