The rays parallel to the principal axis of a spherical mirror, actually meet at a point 15 cm
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15
Explanation:
The mirror is concave mirror and its focal length is -15 cm because the rays actually intersecting after reflection. The rays are parallel to the principal axis, hence they meet at the focus. Therefore, the focal length is -15 cm
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Mirror is converging and its focal length is 15 cm.
Explanation:
For a spherical mirror the rays parallel to the principle axis will always intersect on the focus of the mirror and any ray passing trough the focus of the mirror will go parallel to the principle axis of the mirror after reflection.
Any two parallel rays incident on the surface of a spherical mirror and then actually meet it means that the mirror is of converging nature (concave mirror) and the rays meet on the focal plane.
Focal plane is a plane which is normal to the principle axis and passes through the focus of the mirror.
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TOPIC: spherical mirror
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