Reflection by plane mirror – Ray Optics, Physics – eSaral

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## Reflection by plane mirror:

1. The image formed by the plane mirror is always erect, of the same size, and at the same distance as the object is.
2. 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.
3. 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 $2 \theta$.
4. The image of an object formed by a plane mirror is perverted & if the object is real then a virtual image formed.
5. Image due to a plane mirror is as far behind the mirror as is the object in Infront of it.
6. The magnification produced by the plane mirror is 1 i.e. the size of the image is equal to the size of the object.
7. When the two plane mirrors are parallel to each other, the number of images is infinity.
8. 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
9. 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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