Chapter : 3. Light Reflection
Some Important Results About Reflection From Plane Surfaces
Some Important Results About Reflection From Plane Surfaces
Lateral inversion : When you see your image in a vertical plane mirror such as that fixed to an almirah, the head in the image is up and the feet are down, the same way as you actually stand on the floor. Such an image is called an erect image. However, if you move your right hand, it will appear as if the left hand of your image is moving. If you keep a printed page in front of a plane mirror, the image of the letters appear erect but inverted laterally, or sideways. Such an inversion is called lateral inversion.
Relative motion of object and image :
Case I :
If an object moves towards (or away from) a plane mirror at speed v
The image will also approach (or recede) at speed v
The speed of image relative to object will be v – (–v) = 2v.
Case II :
If the mirror is moved towards or (away from) the object with speed 'v'
The image will move towards (or away from) the object with a speed '2v'.
Multiple Reflection
Number of images formed by combination of plane mirrors depends upon angle θ between mirrors.
If there are two plane mirrors inclined to each other at an angle 90° , the number of images of a point object formed are 3.
Lateral inversion : When you see your image in a vertical plane mirror such as that fixed to an almirah, the head in the image is up and the feet are down, the same way as you actually stand on the floor. Such an image is called an erect image. However, if you move your right hand, it will appear as if the left hand of your image is moving. If you keep a printed page in front of a plane mirror, the image of the letters appear erect but inverted laterally, or sideways. Such an inversion is called lateral inversion.
Relative motion of object and image :
Case I :
If an object moves towards (or away from) a plane mirror at speed v
The image will also approach (or recede) at speed v
The speed of image relative to object will be v – (–v) = 2v.
Case II :
If the mirror is moved towards or (away from) the object with speed 'v'
The image will move towards (or away from) the object with a speed '2v'.
Multiple Reflection
Number of images formed by combination of plane mirrors depends upon angle θ between mirrors.
If there are two plane mirrors inclined to each other at an angle 90° , the number of images of a point object formed are 3.
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