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Mirrors
Image :
When the rays of light, diverging from a point after reflection, they may actually meet at one point or appear to meet at some other point is called “image” of the object”.
Virtual Image :
When the rays of light, diverging from a point after reflection appear to diverge from another point, the image formed is called “virtual image”. It can not be caught on a screen. It is always erect. It can be photographed.
Real Image :
When the rays of light, diverging form a point, after reflection actually converge at some other point, then that point gives us the real image of the object. It can be caught on screen. -
Mirrors
Mirror :
A polished surface form which regular reflection can take place is called mirror. -
Mirrors
Properties of the image formed by a plane mirror :
i) The image is formed as far behind the mirror as the object is in front of it.
ii) The image is formed on the perpendicular drawn, from the object to the mirror produced behind the mirror.
iii) The image is virtual, cannot be taken on a screen.
iv) The image formed as same size as the object.
v) The image is laterally inverted.
vi) If a mirror is rotated through an angle ‘\(\theta\)’ the reflected ray gets rotated through an angle ‘2\(\theta\)’
vii) To see the full image of a person, the required height of the mirror is half of his actual height.
viii) If the mirror moves towards a stationary object with a velocity ‘V’ then, the image will move with same velocity ‘V’ towards the object.
ix) If object moves towards a stationary mirror with a velocity ‘V’, then the image will move with a velocity ‘2V’ towards the object. -
Mirrors
Images formed between two inclined Plane Mirrors:
a) In the case of inclined mirrors, if \(\theta\) is the angle between the mirrors, the number of images formed is given by
i) \( n = \frac{{360}} {\theta } - 1\left[ {When\,\frac{{360}} {\theta }\,is\,\,even\,number} \right] \)
ii) \( n = \frac{{360}} {\theta }\left[ {When\,\frac{{360}} {\theta }\,is\,\,odd\,number} \right] \)
If we get n value as fraction only integer part should be consider
b) For angle of inclination between \( \frac{{360^\circ }} {n} \) and \( \frac{{360^\circ }} {{n + 1}} \) the number of images formed is ‘n’.