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Physics  Ex-47

Back of mirror

Object

An object is placed in front of a plane mirror.

Find the location and

characteristics of the image.

Objects consist of an infinite number of points.

And each point has an infinite number of rays radiating outwards.

Images also consist of an infinite number of points.

Each point on the object has a corresponding point on the image.

In locating an image, we take one point on the object and find its corresponding point (location) on the image object.

As shown above, we usually take the (extreme) top point and find its corresponding point on the image object.

Normal

Normal

We can now draw the image.

There are two steps in finding the image of a plane mirror.

Draw an incident ray slightly upwards towards the mirror.

Then draw its reflected ray in accordance with the law of reflection.

Step-1

Draw an incident ray slightly downwards towards the

mirror, then draw its reflected ray.

Step-2

Since we are not given the location of the object,

we can select any arbitrary location.

Such as right here!

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Where the two reflected rays meet is the image point of the object point.

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