Under what conditions is the focus of a spherical mirror positive and under what conditions is the focus of a spherical mirror negative. Answer with reference to the Cartesian sign symbol.
Answers
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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 + (positive).
Height of image is taken as positive in the case of erect image and taken as negative in the case of inverted image.
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.
In the case of a convex mirror, always an erect image is formed, thus the height of image is taken as positive.
PLZ MARK AS BRILLIANT
When the image which formed from sperical mirror is virtual, then it is negative.
When the image of the special mirror is real, then it is possitive.
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