Physics
A focal plane passes through the focus and is …………… to the principal axis.
- parallel
- inclined
- normal
- none of the above
Reflection
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Answer
normal
Reason — A plane passing through the focus and normal to the principal axis of the mirror, is called the focal plane.
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Related Questions
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
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
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
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