Question

define incident ray?​

Answer 1

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=> An incident ray is a ray of light that strikes a surface.

=> The angle between this ray and the perpendicular or normal to the surface is the angle of incidence.

=> The reflected ray corresponding to a given incident ray, is the ray that represents the light reflected by the surface.

Answer 2

Explanation:

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↪Incident ray: A ray of light from a source that falls on the surface is called an incident ray of light.

An optical lens is a device formed from a transparent material, usually glass, that is designed to converge or diverge light rays. A lens has one or more curved surfaces. We will consider simple lenses having two surfaces, each of which is a portion of a sphere, A line passing through the centers of the two spheres is called the optical axis of the lens. We will concentrate on thin lenses designed for use in air. A thin lens is one with a thickness t that is negligibly small compared to the radius, R1 or R2, of either of the spherical surfaces.

We may relate the optical properties of a thin lens in air (nair = 1) to the geometry and index of refraction n of the lens to describe refractions at each surface of the lens. an arbitrary ray from an object O on the optical axis of a thin lens impinging on the first surface, which has radius R1. The object distance to the first surface is p. That ray is refracted at the first surface toward an image I1, located at a distance q1 from the first surface.