Question

the ____ is the line drawn from the point of incidence at 90° to the surface of the optical device. an ___ is a ray of light that travels toward a reflecting surface. a ___ is a ray of light that bounces off a reflecting surface. the ______ (θᵢ) is the angle between the incident ray and the normal. the ______ (θᵣ) is the angle between the reflected ray and the normal. reflecting surface the ________ is the spot where the incident ray strikes the reflecting surface.

Explanation:

1. For the first blank (left - most): An incident ray is defined as a ray of light that travels toward a reflecting surface. So the term is "incident ray".
2. For the middle - top blank: The normal is the line drawn from the point of incidence at 90° to the surface of the optical device. So the term is "normal".
3. For the middle - left blank (angle): The angle of incidence ($\theta_{i}$) is the angle between the incident ray and the normal. So the term is "angle of incidence".
4. For the middle - right blank (angle): The angle of reflection ($\theta_{r}$) is the angle between the reflected ray and the normal. So the term is "angle of reflection".
5. For the right - most blank: A reflected ray is a ray of light that bounces off a reflecting surface. So the term is "reflected ray".
6. For the bottom - most blank: The point of incidence is the spot where the incident ray strikes the reflecting surface. So the term is "point of incidence".

Answer:

• An $\boldsymbol{\text{incident ray}}$ is a ray of light that travels toward a reflecting surface.
• The $\boldsymbol{\text{normal}}$ is the line drawn from the point of incidence at $90^{\circ}$ to the surface of the optical device.
• The $\boldsymbol{\text{angle of incidence}}$ ($\theta_{i}$) is the angle between the incident ray and the normal.
• The $\boldsymbol{\text{angle of reflection}}$ ($\theta_{r}$) is the angle between the reflected ray and the normal.
• A $\boldsymbol{\text{reflected ray}}$ is a ray of light that bounces off a reflecting surface.
• The $\boldsymbol{\text{point of incidence}}$ is the spot where the incident ray strikes the reflecting surface.