If the focal length of objective lens is increased then magnefying power of:
microscope will increase but that of telescope decrease.
microscope and telescope both will increase.
microscope and telescope both will decrease.
microscope will decrease but that of telescope increase.
In the Young's double-slit experiment, the intensity of light at a point on the screen where the path difference is is K, ( being the wave length of light used). The intensity at a point where the path difference is , will be:
A beam of light from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is: