A student in Trinidad conducts an experiment using a plane mirror. She places an object 15 cm in front of the mirror. What is the distance between the object and its image?

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Question

A student in Trinidad conducts an experiment using a plane mirror. She places an object 15 cm in front of the mirror. What is the distance between the object and its image?

Accepted Answer

30 cm — Award 1 mark for recognizing that the image is formed 15 cm behind the mirror, making the total distance 15 cm + 15 cm = 30 cm. A is incorrect — this would be half the object distance. B is incorrect — this is only the object distance from the mirror. D is incorrect — this results from incorrect multiplication.

Answer

45 cm

Answer

7.5 cm

Answer

15 cm

Answer

30 cm

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