12.For observing Fraunhofer diffraction from a single slit, what type of wave front should be incident on the slit ?
Plane wave-front should be incident on the slit, for observing Fraunhofer diffraction
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13.A ray of light falls on a right angled prism ABC (AB = BC) and travels as shown in Fig. below. What is the refractive index of the material of the prism ?
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14.A simple microscope or a magnifying glass with a focal length 5 cm forms an image at the near point of the eye. Find its magnification.
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15.How can a pile of glass plates be used to produce polarised light ?
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16.State two basic differences between primary and secondary rainbows.
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17.A radio transmitter operates on a wavelength of 1500 m at a power of 400 kW. Find the energy of the radio photons in joules.
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18.
The radius of the first orbit of the electron of a hydrogen atom is 5.3 x 10-11 m. What is the radius of its second orbit ?
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