Questions in Ray Optics and Optical Instruments

Select	Question
	If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope
	The magnifying power of a simple microscope is 6. The focal length of its lens in metres will be, if least distance of distinct vision is 25$cm$
	Two points separated by a distance of 0.1 mm can just be resolved in a microscope when a light of wavelength 6000 Å is used. If the light of wavelength 4800Å is used this limit of resolution becomes
	A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power is 100. The magnifying power of the other lens is
	The angular magnification of a simple microscope can be increased by increasing
	Wavelength of light used in an optical instrument are ${{\lambda }_{1}}=4000$Å and ${{\lambda }_{2}}=5000$Å, then ratio of their respective resolving power (corresponding to ${{\lambda }_{1}}$and ${{\lambda }_{2}})$is
	The separation between two microscopic particles is measured ${{P}_{A}}$ and ${{P}_{B}}$ by two different lights of wavelength 2000 Å and 3000 Å respectively, then
	The image formed by an objective of a compound microscope is
	An achromatic telescope objective is to be made by combining the lenses of flint and crown glasses. This proper choice is
	If $F_o$ and $F_e$ are the focal length of the objective and eye-piece respectively of a telescope, then its magnifying power will be