If an image formed by a spherical mirror is real and inverted, which of the following correctly describes the sign of the image distance according to the sign convention?
Image distance is negative
In the New Cartesian sign convention, the object is placed to the left of the mirror, all distances are measured from the pole, distances measured in the direction of the incident light (to the right) are positive and distances measured against it (to the left) are negative.
A real image is formed where reflected rays actually meet, and for a mirror the reflected rays travel back to the left, in front of the mirror on the same side as the object. Such a real, inverted image (formed by a concave mirror) therefore lies to the left of the pole, so the image distance v is negative.
A positive image distance means the image is behind the mirror, which is true only for virtual, erect images. The image distance cannot be zero for a real image, and its sign is fixed by the nature of the image, so it is not variable.
Hence, Image distance is negative.
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Twinkling of stars is due to:
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A. Rear View mirrors in vehicles
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C. Makeup Mirror
D. Kaleidoscope
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