What is paraxial lens?
A paraxial ray is a ray which makes a small angle (θ) to the optical axis of the system, and lies close to the axis throughout the system.
What is paraxial vision?
In optics: Paraxial, or first-order, imagery. In a lens that has spherical aberration, the various rays from an axial object point will in general intersect the lens axis at different points after emerging into the image space.
What is paraxial ray tracing?
Paraxial ray tracing assumes that the tangent and sine of all angles are equal to the angles themselves (in other words, tan(u)=u and sin(u)=u ). This approximation is valid for small angles but can lead to the propagation of error as ray angles increase.
What is a floating aperture in zemax?
Float By Stop Size is one way to define the aperture of your system. It means that the system aperture is determined by the semi-diameter of the stop surface (regardlesss of its location), which is set by the user as the Clear Semi-Diameter value in the Lens Data Editor.
What is non paraxial rays?
Nonparaxial rays of light (those some distance from the center of the lens) do not behave the same way as paraxial rays when they pass through the lens. In general, they do not intersect (focus) at exactly the same point behind the lens.
What is the paraxial region?
The hypothetical cylindrical narrow space surrounding the optical axis within which rays of light are still considered paraxial.
Which rays are called paraxial rays?
Solution : The rays of light close to the pole and which make small angles with the principal axis, are called paraxial rays. Answer.
What is the stop in zemax?
It comes after the lens. In this case, the stop is also the exit pupil. We can still consider the stop as an object to be imaged by the lens (just trace rays right to left this time). The stop image in this case is the entrance pupil (see Figure 5.5).
What is entrance and exit pupil?
In an optical system, the entrance pupil is the optical image of the physical aperture stop, as ‘seen’ through the front (the object side) of the lens system. The corresponding image of the aperture as seen through the back of the lens system is called the exit pupil.
What is the difference between paraxial rays and marginal rays in an optical system?
A paraxial ray is a ray which makes a small angle to the optical axis of the system, and lies close to the axis throughout the system. Marginal rays are light rays that passes through an optical system away from the optical axis, towards the edge of the lens aperture.