Questions in Ray Optics and Optical Instruments

Select	Question
	A camera objective has an aperture diameter d. If the aperture is reduced to diameter $d/2,$ the exposure time under identical conditions of light should be made
	The light gathering power of a camera lens depends on
	The exposure time of a camera lens at the $\frac{f}{2.8}$ setting is $\frac{1}{200}$ second. The correct time of exposure at $\frac{f}{5.6}$ is
	Ability of the eye to see objects at all distances is called
	Identify the wrong description of the figures below
	The focal lengths of the objective and eye-lens of a microscope are 1 cm and 5 cm respectively. If the magnifying power for the relaxed eye is 45, then the length of the tube is
	In a compound microscope magnification will be large, if the focal length of the eye piece is
	The focal length of the objective lens of a compound microscope is
	Microscope is an optical instrument which
	Magnifying power of a simple microscope is (when final image is formed at $D = 25 cm$ from eye)