Questions in Ray Optics and Optical Instruments

Select	Question
	If in compound microscope $m_1$ and $m_2$ be the linear magnification of the objective lens and eye lens respectively, then magnifying power of the compound microscope will be
	For which of the following colour, the magnifying power of a microscope will be maximum
	The length of the compound microscope is 14 cm. The magnifying power for relaxed eye is 25. If the focal length of eye lens is 5 cm, then the object distance for objective lens will be
	If the focal length of objective and eye lens are 1.2 cm and 3 cm respectively and the object is put 1.25 cm away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is
	The focal length of objective and eye lens of a microscope are 4 cm and 8 cm respectively. If the least distance of distinct vision is 24 cm and object distance is 4.5 cm from the objective lens, then the magnifying power of the microscope will be
	When the length of a microscope tube increases, its magnifying power
	In a compound microscope, if the objective produces an image $I_o$ and the eye piece produces an image $I_e$, then
	The magnifying power of a simple microscope can be increased, if we use eye-piece of
	An electron microscope is superior to an optical microscope in
	The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is