Question

A group of rays is called

• A. Light beam
• B. Ray beam
• C. Both (A) and (B)
• D. None of these

Hint:

Remember that a beam of light can be of three types: parallel (rays are parallel), convergent (rays meet at a point), or divergent (rays spread out from a point).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
In optics, specific terms are used to describe the path and collection of light.
\[\begin{array}{rl} \bullet & \text{Ray of light: The path along which light energy travels in a given direction. It is represented by a straight line with an arrow. } \\ \bullet & \text{Beam of light: A bundle or collection of a large number of light rays. } \\ \end{array}\]

Step 2: Detailed Explanation:
A group of light rays is called a beam of light. The term "Light beam" is the standard and widely accepted terminology in physics. While "Ray beam" might seem descriptive, it is not the conventional term. A beam is inherently made of rays, so "Ray beam" is redundant. The correct technical term is "Light beam" or "beam of light". Given the options, "Light beam" is the most accurate and standard choice.

Step 3: Final Answer:
The standard term for a group of rays is a light beam.