If a mirror has a focal length of -15 cm , then it is a _____ mirror.
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we know that concave mirror has negative focal length so it is a concave mirror
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Answer:
Concave mirror
Explanation:
Given that, the focal length of the mirror is -15 cm. We know that there are two types of spherical mirror i.e. concave and convex mirrors. The focal length of concave mirror is negative.
The spherical mirrors are the part of a sphere. The focal length of a mirror is the distance from the pole of the mirror to the focus. Focal length is the half of the radius of curvature of the mirror.
So, If a mirror has a focal length of -15 cm , then it is a concave mirror.
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