Physics · Light - Reflection and Refraction
The principal focus of a concave mirror is defined as:
- 1the exact geometric center of the reflecting surface of the spherical mirror
- 2a point behind the mirror where reflected rays appear to diverge from
- 3a point on the principal axis where incident rays parallel to the principal axis converge after reflection✓
- 4a point on the principal axis, halfway between the pole and the center of curvature where the image is always formed
Correct answer
a point on the principal axis where incident rays parallel to the principal axis converge after reflection
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