JEE Main 2026 · 6 Apr · Shift 2 · Physics Q50

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A concave mirror of focal length 10 cm forms an image which is double the size of object when the object is placed at two different positions. The distance between the two positions of the object is ________ cm.

Your answer

Answer and worked solution

Official answer: 10

Magnification. With $f=-10$ cm, $m=\dfrac f{f-u}$ .

$m=-2$ (real image): $u=-15$ cm.
$m=+2$ (virtual image): $u=-5$ cm.

Distance between the positions: 10 cm.

Answer: 10

Topics:Spherical mirrors

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JEE Main 2026 · 6 Apr · Shift 2, Physics question 50