Write two rules of each concave and convex mirror with reason
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Sign in the case of concave mirror:
Since, object is always placed in front of the mirror hence the sign of object is taken as negative.
Since, the centre of curvature and focus lie in front of the concave mirror, so signs of radius of curvature and focal length are taken as negative in the case of concave mirror.
When image is formed in front of the mirror, the distance of image is taken as – (negative) and when image is formed behind the mirror, the distance of image is taken as +
Sign in the case of a convex mirror:
Since, object is always placed in front of the mirror hence the sign of object is taken as negative.
Since, the centre of curvature and focus lies behind the convex mirror, so sign of radius of curvature and focal length are taken as + (positive) in the case of convex mirror.
In the case of convex mirror, image always formed behind the mirror, thus the distance of image is taken as positive.
Sign in the case of concave mirror:
Since, object is always placed in front of the mirror hence the sign of object is taken as negative.
Since, the centre of curvature and focus lie in front of the concave mirror, so signs of radius of curvature and focal length are taken as negative in the case of concave mirror.
When image is formed in front of the mirror, the distance of image is taken as – (negative) and when image is formed behind the mirror, the distance of image is taken as +
Sign in the case of a convex mirror:
Since, object is always placed in front of the mirror hence the sign of object is taken as negative.
Since, the centre of curvature and focus lies behind the convex mirror, so sign of radius of curvature and focal length are taken as + (positive) in the case of convex mirror.
In the case of convex mirror, image always formed behind the mirror, thus the distance of image is taken as positive.
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