When a ray of light is incident on a mirror, it gets reflected in accordance with the following laws of reflection: 

First law: The incident ray, the reflected ray and the normal at the point of incidence all three, lie in the same plane. 

Second law: The angle of incidence (i) is equal to the angle of reflection (r).

i.e.,                           ∠i = ∠r. 


 

Fig. Reflection in a plane mirror 

Yes, the same laws of reflection are valid for both plane and curved surfaces. 

Properties of images formed by a plane mirrors:

1. The image formed by a plane mirror is virtual and erect.
2. Image formed is of the same size as the object.
3. The image is formed as far behind the mirror as the object is in front of it i.e., object distance is equal to the image distance. 
4. Image is laterally inverted i.e., image is inverted sideways with respect to the object.

Lateral inversion: Sideways reversal of the image is known as lateral inversion. If we stand before a plane mirror and move our right hand, our image appears to move its left hand. Infact, our entire image is reversed sideways. 

         
 
Fig.  Lateral inversion before a mirror 

Cause of lateral inversion: In a plane mirror, the image is as far behind the mirror as the object is in front of it and that the front of the image and the front of the object face each other. This is the cause of lateral inversion in plane mirror.

The laterally inverted image of the word LEFT is as shown in the figure above.
The images of symmetrical letters like A, H, I, M, O, T, U, V, W, X, Y, 8 are not affected by lateral inversion.