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How Far Should an Object Be Placed from the Pole of a Converging Mirror of Focal Length 20cm to Form a Real Image of the Size Exactly `1/4`Th the Size of the Object? - Science

How far should an object be placed from the pole of a converging mirror of focal length 20cm to form a real image of the size exactly `1/4`th the size of the object?

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Focal length of the concave mirror (f) = 20 cm
Magnification (m) = -1/4
Using the magnification formula, we get  




Using the mirror formula, we ge




u=100 cmThus, the object should be placed in front of the concave mirror at a distance of 100 cm


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Lakhmir Singh Class 10 Physics (Science)
Chapter 4 Reflection of Light
Q 26 | Page 199
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