[" 15.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 statements is correct? "]

A parallel beam of fast moving electron 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 correct?

A parallel beam of fast moving electrons is incident normally on a narrow slit. A flueroscent screen is placed at a large distance from the slit. If the speed of the electron is increased, which of the following statements is correct ?

A parallel beam of x-rays 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 statements is correct?

A parallel beam of light of wavelength lambda is incident normally on a single slit of width d. Diffraction bands are obtained on a screen placed at a distance D from the slit. The second dark band from the central bright band will be at a distance given by

A parallel beam of light of wavelength l is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is

A parallel beam of monochromatic light is incident normally on a slit. The diffraction parttern is observed on a screen placed at the focal plane of convex lens. If the slit width is increased , the central maximum of the diffraction pattern will

A parallel beam of light of wavelength lambda is incident normally on a single slit of width d. Diffraction bands are obtained on a screen placed at a distance D from the slit. The second dark band from the central bright band will be at a distance given by ....