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^-1the speed (in cms^-1) w…

Question

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^-1the speed (in cms^-1) with which image moves at that instant is

Accepted Answer

Correct answer: 1. 1JEE Main 2020 For concave mirror 1v+ 1u= 1f |m |= |- vu |= 1030= 13 v_ image=v_ object (m^2 ) ⇒v_ image=9 19=1 cm/s

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

Solution

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