Photoelectric effect was given by? Maximum detail of an object can be seen by a microscope when the object is illuminated by light of? The wavelength of X-rays is of the order? A man is standing at a distance of 10 m from a plane mirror. The distance between his image and himself is? The thinner part of wedge film is always? A diffraction grating is a glass plate having a large number of equidistant slits?