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Reflection by plane mirror:
- The image formed by the plane mirror is always erect, of the same size, and at the same distance as the object is.
- To see the full image in a plane mirror, its length is just half the height of the man and it has to be kept in a specific position.
- When the plane mirror or any reflecting surface is turned through an angle $\theta$ and if the incident ray remains stationary, then the reflected ray will turn through $2 \theta$.
- The image of an object formed by a plane mirror is perverted & if the object is real then a virtual image formed.
- Image due to a plane mirror is as far behind the mirror as is the object in Infront of it.
- The magnification produced by the plane mirror is 1 i.e. the size of the image is equal to the size of the object.
- When the two plane mirrors are parallel to each other, the number of images is infinity.
- When two plane mirrors is held at angle $\theta$ with their reflecting surfaces facing each other and an object is placed between them, images are formed by successive reflections.
First of all, we will calculate
$n=\frac{360}{\theta}$
Then
- If the angle between the two mirrors is $\theta$, the deviation produced by successive reflections is
$\delta=\delta_{1}+\delta_{2}=2 \pi-2 \theta$
Note : When reflection takes place by a smooth surface, it is called regular reflection, but when reflection takes place by a rough surface, it is called diffused reflection.
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