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Physics

Image Formation by a Plane Mirror

An object is ...

Question

An object is initially at a distance of 160 cm from a plane mirror. If the mirror approaches the object at a rate of 10cm/s then after 4s the distance between the object and its image will be

320 c m

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280 c m

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240 c m

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120 c m

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Solution

The correct option is C $240 c m$

After 4sec, the distance travelled by the mirror is $4 \times 10 = 40 c m$

So after 4sec total distance between the object and the image is 240cm

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An object is initially at a distance of 160 cm from a plane mirror. If the mirror approaches the object at a rate of 10cm/s then after 4s the distance between the object and its image will be

The correct option is C 240cm After 4sec, the distance travelled by the mirror is 4×10=40 cm So after 4sec total distance between the object and the image is 240cm

The correct option is C $240 c m$

After 4sec, the distance travelled by the mirror is $4 \times 10 = 40 c m$

So after 4sec total distance between the object and the image is 240cm