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4 rules for tracing the image formed by concave mirror

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The intersection of at least two reflected rays give the position of image of the point object. Any two of the following rays can be considered for locating the image.

1. A ray parallel to the principal axis, after reflection, will pass through the principal focus in case of a concave mirror.

2. A ray passing through the principal focus of a concave mirror after reflection, will emerge parallel to the principal axis.

3. A ray passing through the centre of curvature of a concave mirror, after reflection, is reflected back along the same path.

4. A ray incident obliquely to the principal axis, towards pole of the mirror, on the concave mirror is reflected obliquely.

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shubham.krishnan

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