Questions in Ray Optics and Optical Instruments

Select	Question
	A telescope of diameter 2m uses light of wavelength 5000 Å for viewing stars. The minimum angular separation between two stars whose image is just resolved by this telescope is
	A simple magnifying lens is used in such a way that an image is formed at 25 cm away from the eye. In order to have 10 times magnification, the focal length of the lens should be
	In a simple microscope, if the final image is located at infinity then its magnifying power is
	In a compound microscope the objective of ${{f}_{o}}$ and eyepiece of ${{f}_{e}}$ are placed at distance L such that L equals
	For a compound microscope, the focal lengths of object lens and eye lens are ${{f}_{o}}$and ${{f}_{e}}$ respectively, then magnification will be done by microscope when
	The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order
	The resolving power of an astronomical telescope is 0.2 seconds. If the central half portion of the objective lens is covered, the resolving power will be
	An astronomical telescope has objective and eye-piece lens of powers 0.5 D and 20 D respectively, its magnifying power will be
	Which of the following is not correct regarding the radio telescope
	The diameter of objective of a telescope is 1m. Its resolving limit for the light of wave length 4538 Å, will be