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QJEEM20Ph3aad: JEE Main 2020 Physics - Class 12 JEEM20Ph3aad Solution: When an object is kept at a distance of 30 cm from a concave…

When an object is kept at a distance of 30 cm from a concave mirror, the image is formed at a distance of 10 cm from the mirror. If the object is moved with a speed of 9 cms–1, the speed (in cms–1) with which image moves at that instant is ____.

Step-by-Step Verified Solution

VI = Velocity of image with respect to mirror

V0 = Velocity of object with respect to mirror

∣VI→∣=∣−v2u2V0→∣|\overrightarrow {{V_I}}| = |- {{{v^2}} \over {{u^2}}}\overrightarrow {{V_0}} |

=∣−10×1030×30×9∣= | - {{10 \times 10} \over {30 \times 30}} \times 9|

=1= 1 cm/s

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