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An imaginary straight line passing through the pole and the centre of curvature of a spherical mirror is called as ________.
emergent ray
reflected ray
principal axis
incident ray
principal axis
The principal axis is the imaginary straight line that passes through the pole (P) and the centre of curvature (C) of a spherical mirror. This line acts as the normal to the mirror at the pole and serves as a reference axis for all measurements in sign convention.
The principal axis is the imaginary straight line that passes through the pole (P) and the centre of curvature (C) of a spherical mirror. This line acts as the normal to the mirror at the pole and serves as a reference axis for all measurements in sign convention.
Think of the principal axis like the 'spine' or the 'central axle' of the mirror; just as an axle defines the axis of rotation for a wheel, the principal axis defines the central path along which light rays travel to be focused by the mirror.
R=2f тАФ where R is the radius of curvature and f is the focal length, both lying on the principal axis.
In optics, a spherical mirror is a small part of a sphere. The geometric symmetry of this sphere dictates that a line connecting the center of the sphere to any point on its surface acts as a normal. By definition, the principal axis connects the center of curvature (center of the sphere) to the pole (center of the reflecting surface), perpendicular to the tangent at the pole.
The principal axis is perpendicular to the mirror surface at the pole.
Parallel incident rays close to the principal axis converge at or appear to diverge from the principal focus (F).
All distances are measured from the pole along the principal axis in the Cartesian sign convention.
Ray diagram construction for image formation.
Calculation of mirror magnification and object/image distances.
An incident ray is the incoming light ray before reflection.
A reflected ray is the light ray bouncing off the surface.
An emergent ray is typically associated with refraction through glass slabs or prisms, not mirrors.
C is correct тАФ The principal axis is defined as the imaginary straight line passing through the pole and the centre of curvature of a spherical mirror.
Remember that the principal axis is essentially the normal line at the pole; knowing this helps in understanding why light rays passing through the center of curvature reflect back along the same path.
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