Wave Optics
A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statement is correct?
As a result of interference of two coherent sources of light, energy is:
During interference, the pattern contains both maxima and minima. This means that the energy emitted by two coherent sources are redistributed in the fringe pattern and the distribution is space dependent and time independent.
A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statement is correct?
For Bragg's diffraction by a crystal to occur, then which of the following is correct for the X-ray of wavelength $$\lambda$$ and interatomic distance d :
A plane monochromatic wave of natural light with intensity $$I_0$$ falls normally on a screen composed of two touching Polaroid half-planes. The principal direction of one Polaroid is parallel and that of the other between them. What kind of diffraction pattern is formed behind the screen? What is the intensity of light behind the screen at the points of the plane perpendicular to the screen and passing through the boundary between the Polaroids?
A light with wavelength $$\lambda = 0.60 \mu m$$ falls normally on a diffraction grating inscribed on a plane surface of a plano-convex cylindrical glass lens with curvature radius $$R = 20 cm$$. the period of grating is equal to $$d = 6.0 \mu m$$. Find the distance between the principal maxima of first order located symmetrically in the focal plane of that lens.
Light with wavelength $$\lambda$$ falls on a diffraction grating at right angles. Find the angular dispersion of grating as a function of diffraction angle $$\theta$$.