Questions in Ray Optics and Optical Instruments

Select	Question
	The relation between the linear magnification $m,$ the object distance $u$ and the focal length $f$ is
	While using an electric bulb, the reflection for street lighting should be from
	A concave mirror is used to focus the image of a flower on a nearby well $120cm$ from the flower. If a lateral magnification of $16$ is desired, the distance of the flower from the mirror should be
	A virtual image larger than the object can be obtained by
	An object is placed $40cm$ from a concave mirror of focal length $20cm.$ The image formed is
	A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature $36cm.$The distance of the object from the mirror is
	Radius of curvature of concave mirror is $40cm$ and the size of image is twice as that of object, then the object distance is
	All of the following statements are correct except
	If an object is placed $10cm$ infront of a concave mirror of focal length $20cm,$ the image will be
	Which of the following form(s) a virtual and erect image for all positions of the object