Question Video: Identifying a Concave Mirror | Nagwa Question Video: Identifying a Concave Mirror | Nagwa

# Question Video: Identifying a Concave Mirror Science • Third Year of Preparatory School

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Which of the mirrors in the diagram below is a concave mirror? Incident light is shown by the yellow lines.

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### Video Transcript

Which of the mirrors in the diagram below is a concave mirror? Incident light is shown by the yellow lines.

Here we see two mirrors, Mirror 1 and Mirror 2. The difference between them is the way that they’re curved with respect to the incoming light. Mirror 1, we see, is curved outward, bulging towards the incoming light, we could say. Opposite to this is mirror 2, which we see is curved inward. We want to know which of these two mirrors is a concave mirror. One way we can remember the shape of a concave mirror is to think about the word cave in this name. Just like a cave is something that we travel into, a concave mirror, we could say, is something that light travels into inside this curving arc. Because the light reaching Mirror 2 is entering into the curve of the mirror, we know that this mirror is concave.

Of these two mirrors then, Mirror 2 is the concave mirror.

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