Question

What happens if ray passes through a principal axis?

Answer 1

Answer:

Explanation:

One ray of light becomes parallel to the principal axis of the lens and thus, passes through another focus after refraction through the lens. Another ray of light passes through the optical centre of the lens and goes straight.

Answer 2

If a ray of light passes through a principal axis of a lens or a mirror, it will be undeflected.

• This means that the ray will not change direction as it passes through the lens or is reflected off the mirror. Instead, it will continue on its original path.
• This property is known as the principle of transverse ray displacement and is a result of the symmetry of lenses and mirrors about their principal axes.

• The location of the principal axis of a lens or mirror can be found by drawing a line through the center of the lens or mirror and perpendicular to the surface.
• If a ray of light passes through this axis, it will not be deflected. This property can be used to design optical systems that allow light to pass through or be reflected without changing direction.
• The location of the principal axis of a lens can be found by drawing a line through the center of the lens and perpendicular to the surface. If a ray of light passes through this axis, it will not be refracted.
• If the ray of light passes through the lens at an angle that is not perpendicular to the principal axis, it will be refracted, or bent, as it passes through the lens

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