A point source of light is moving at a r...

A point source of light is moving at a rate of `2 cm-s^(-1)` towards a thin convex lens of focal length 10 cm along its optical axis. When the source is 15 cm away from the lens the image is moving at -

`4 cm-s^(-1)` towards the lens

`8 cm-s^(-1)` towards the lens

`4 cm-s^(-1)` away from the lens

`8 cm-s^(-1)` away from the lens

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