Physics
The focus of a concave mirror is a point on the …………… through which the light rays incident …………… to the principal axis pass after reflection from the mirror.
- centre of curvature, perpendicular
- principal axis, parallel
- principal axis, perpendicular
- aperture, parallel
Reflection
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Answer
principal axis, parallel
Reason — The focus of a concave mirror is a point on the principal axis through which the light rays incident parallel to the principal axis, pass after reflection from the mirror.
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Related Questions
A …………… mirror is made by silvering the …………… surface of a piece of a hollow sphere.
- concave, inner
- convex, inner
- convex, outer
- None of the above
The correct statement(s) is/are :
(i) The radius of a sphere of which the spherical mirror is a part is called the radius of curvature.
(ii) The geometric centre of the spherical surface of a mirror is called the centre of curvature.
(iii) Principal axis is the straight line joining the pole of the mirror to its aperture.
- (i)
- (ii)
- (iii)
- None of the above
For an incident ray directed towards center of curvature of a spherical mirror, the reflected ray:
- retraces it's path
- passes through the focus
- passes through the pole
- becomes parallel to the principal axis
A ray either incident from the focus (or converging at the focus), after reflection from a spherical mirror :
- becomes perpendicular to the principal axis
- becomes parallel to the principal axis
- becomes normal to the focus
- passes through the centre of curvature