Physics
A concave mirror has a …………… focus, whereas a convex mirror has a …………… focus.
- real and virtual, real
- real, virtual
- virtual, real
- virtual, real and virtual
Reflection
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Answer
real, virtual
Reason — A concave mirror has a real focus because the light rays incident parallel to the principal axis, after reflection actually pass through the focus.
A convex mirror has a virtual focus because the light rays incident parallel to the principal axis, appear to come from the focus after reflection from the mirror.
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Related Questions
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
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
A focal plane passes through the focus and is …………… to the principal axis.
- parallel
- inclined
- normal
- 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