Science
In the following cases, a ray is incident on a concave mirror. In which case is the angle of incidence equal to zero?
options
- A ray parallel to the principal axis.
- A ray passing through the centre of curvature and incident obliquely.
- A ray passing through the principal focus and incident obliquely.
- A ray incident obliquely to the principal axis, at the pole of the mirror.
Reflection of Light
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Answer
A ray passing through the centre of curvature and incident obliquely.
Reason — For a concave (spherical) mirror, the normal at any point on the surface is the radius drawn to that point. A ray that passes through the centre of curvature (C) travels along the radius, so it meets the mirror normally at the point of incidence; hence the angle of incidence is zero.
Rays parallel to the principal axis or striking at the pole obliquely or through the focus, all meet the mirror at a non-zero angle to the local normal.
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