Fig. shows a surface XY separating two transparent media, medium 1 and medium 2. Lines ab and cd represent wavefronts of a light wave travelling in medium 1 and incident on XY. Line ef and gh represent wavefront of the light wave in medium 2 after rafraciton. Speed of light isA. the same in medium 1 and medium 2B. larger I medium 1 than in medium 2C. larger in medium 2 than in medium 1D. different at b and d.

Fig. shows a surface XY separating two transparent media, medium 1 and

1.	Fig. shows a surface XY separating two transparent media, medium 1 and medium 2. Lines ab and cd represent wavefronts of a light wave travelling in medium 1 and incident on XY. Line ef and gh represent wavefront of the light wave in medium 2 after rafraciton. Speed of light isA. the same in medium 1 and medium 2B. larger I medium 1 than in medium 2C. larger in medium 2 than in medium 1D. different at b and d.
Answer» Correct Answer - B

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Angular width of central maxima in the Fraunhofer 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 beA. `3500 Å`B. `4200 Å`C. `4700 Å`D. `6000 Å`
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