Test Index

JAMB Physics 2016 Paper

Question : 7

Total: 48

Solution:

Concept:

For a plane mirror, the image is as far behind the mirror as the object is in front of it.

Explanation:

Initial object-mirror distance is

15 \, \text{cm}

The mirror is moved

5 \, \text{cm}

further away from the object.

New object-mirror distance:

15 \, \text{cm} + 5 \, \text{cm} = 20 \, \text{cm}

So the image is

20 \, \text{cm}

behind the mirror.

Distance between object and image:

20 \, \text{cm} + 20 \, \text{cm} = 40 \, \text{cm}

Answer:

40 \, \text{cm}

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