Transmission of light in opital fiber is due to

The colour of sky is due to (a) Absorption of light by atmospheric gases (b) Transmission of light (c) Wavelength of scattered light (d) All of these

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In a diffraction pattern due to a single slit of width a, the first minimum is observed at an angle 30 degree∘ when light of wavelength 5000 Å is incident on the slit. The first secondary minimum is observed at an angle of

Angular width of central maxima in the Fraunhoffer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength 6000Å. When the slit is illuminated by light of another wavelength, the angular width decreases by 30%. The wavelength of this light will be