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Physics · PYQ NEET UG 2018
हिन्दीAn object is placed at a distance of \( 40\text{ cm} \) from a concave mirror of focal length \( 15\text{ cm} \). If the object is displaced through a distance of \( 20\text{ cm} \) towards the mirror, the displacement of the image will be
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Correct answer · Option B
36 cm away from the mirror.
Explanation
For \( u_1 = -40\text{ cm} \), \( v_1 = -24\text{ cm} \). When displaced by \( 20\text{ cm} \) towards the mirror, \( u_2 = -20\text{ cm} \), giving \( v_2 = -60\text{ cm} \). Image moves \( 60 - 24 = 36\text{ cm} \) away from the mirror.
