Define the principle axis

Define the principle axis?

• A line that goes through the centre of the surface of a spherical mirror or lens, as well as the centre of curvature of all segments of the mirror or lens, is known as the primary axis.
• An axis is a simple imaginary line that separates distinct coordinates or quadrants, or an imaginary line that goes through a symmetry centre. A line along which light may flow through a mirror without deviating in an optical system having a lens, whether it be a convex or concave lens.
• When designing an optical system with a lens, we normally start with the lens and then draw a line or ray that goes through the lens centre without deviating. In an optical system, this line is typically utilised as a measuring system.
• Positive values are assigned to distances measured upward from the optical axis, whereas negative values are assigned to distances recorded below this axis. The primary axis is the axis that runs through the centre of the chart.
• A line that passes across both the curvatures of the lens is known as a primary axis. It’s also known as the line that links the lens’s two focal points.
• The focal length of a lens is the distance between the lens’s centre and the focal point. A concave lens’s focal length is negative, whereas a convex lens’s focus length is positive.
• The line that runs through the geometrical centre of the lens and connects the two centres of curvature of its surfaces is known as the primary axis of a lens. The optical axis of a lens is also referred to as its primary axis.
• A lens’s axis is a straight line that passes through the lens’s optical centre.