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  4. An object ' o ' is placed at a distance of 100 cm in front of a concave mirror of radius of curvature 200 cm as shown in the figure. The object starts moving towards the mirror at a speed 2 cm / s. The position of the image from the mirror after 10 s will be at ....... cm.

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Q. An object ' $o$ ' is placed at a distance of $100\, cm$ in front of a concave mirror of radius of curvature $200\, cm$ as shown in the figure. The object starts moving towards the mirror at a speed $2 \, cm / s$. The position of the image from the mirror after $10\, s$ will be at ....... $cm$.Physics Question Image

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Solution:

After $10 \sec$.
$u =-80 \,cm$
$f =-100 \,cm$
$\frac{1}{ v }+\frac{1}{ u }=\frac{1}{ f }$
$v =400\, cm$