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What sign (+ve or −ve) has been given to the following on the basis of Cartesian Sign Convention?
(a) Height of a real image.
(b) Height of a virtual image.
On the basis of Cartesian Sign Convention:
(a) A negative sign $(-)$ is given to the height of a real image.
(b) A positive sign $(+)$ is given to the height of a virtual image.
Explanation
A real image is always formed below the principal axis, whereas a virtual image is always formed above the principal axis.
Therefore, according to the Cartesian sign convention, the image formed below the axis or downwards, it's given a negative sign, whereas the image formed above the axis or upwards, it's given a positive sign.
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