Physics · 2020
JEE Main · 3 September 2020, Shift 2 · Q25
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…
When an object is kept at a distance of $\displaystyle 30$ cm from a concave mirror, the image is formed at a distance of $\displaystyle 10$ cm from the mirror. If the object is moved with a speed of $\displaystyle 9 \mathrm{cms}^{-1}$, the speed (in $\displaystyle \mathrm{cms}^{-1}$ ) with which image moves at that instant is
\_\_\_\_.
Official answer
1
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.