A ray travelling parallel to the principal axis of a concave mirror is reflected:
Aback along its own incoming path
Bparallel to the principal axis
Cthrough the principal focus
Dthrough the centre of curvature
Answer & Solution
Correct answer: C. through the principal focus
1. Three standard rules locate images in a curved mirror.
2. A ray parallel to the principal axis is reflected through the principal focus.
3. A ray passing through the principal focus is reflected parallel to the principal axis, the reverse of the first rule.
4. A ray passing through the centre of curvature strikes the mirror normally and is reflected back along its own path.
5. Drawing any two of these rules locates the image, which is how the position and nature of the image are found.
_Source: NECTA CSEE 2022 Physics 031, Question 1: Multiple Choice, item (iv)_
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