When an object is kept at a distance 20 cm in front of a concave mirror, a real image is formed at the centre of curvature of the mirroe. Magnification produced by the mirroe is ______________ .
-1
The correct answer is Option 3 i.e. -1.
Explanation:
Given:
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Object distance (u) = –20 cm (negative as it's in front of the mirror)
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Image is formed at the centre of curvature, so Image distance (v) = –20 cm (Real image formed on the same side as the object, so it’s negative)
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Magnification (M) for a mirror is given by:
M=v/u
Substitute the values:
M=−20/−20 = +1
But for a real image formed by a concave mirror, the image is inverted, so the magnification is negative:
M =−1
Other options explained:
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–20: would imply the image is 20 times larger, which isn’t the case here.
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–10: not matching the actual image and object distances.
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–0.5: would mean the image is smaller than the object.
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- A concave mirror forms a real and inverted image of a distant object at a distance of $15 \text{ cm}$ from the mirror.
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