Questions in Ray Optics and Optical Instruments

Select	Question
	A man having height 6 m. He observes image of 2 m height erect, then mirror used is
	A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle $\theta$, the reflected light will deviate from its original path by the angle
	Focal length of a plane mirror is
	A ray of light is incident at 50° on the middle of one of the two mirrors arranged at an angle of 60° between them. The ray then touches the second mirror, get reflected back to the first mirror, making an angle of incidence of
	A convex mirror of focal length $f$ forms an image which is $\frac{1}{n}$ times the object. The distance of the object from the mirror is
	A diminished virtual image can be formed only in
	Which of the following could not produce a virtual image
	An object $5cm$ tall is placed $1m$ from a concave spherical mirror which has a radius of curvature of $20cm$ The size of the image is
	The focal length of a concave mirror is $50cm.$ Where an object be placed so that its image is two times and inverted
	An object of size $7.5cm$ is placed in front of a convex mirror of radius of curvature $25cm$ at a distance of $40cm.$The size of the image should be