The rays of sunlight that move straight from the sun perpendicular to the surface of the Earth are called direct rays.
The rays of sunlight that move straight from the sun and are perpendicular to the surface of the Earth are called direct rays. To arrive at this answer, you can use your understanding of geometry and the properties of light. The term "perpendicular" means forming a right angle or being at 90 degrees to the surface. Since the rays of sunlight are said to be perpendicular to the Earth's surface, it suggests a direct path from the sun to the Earth. Hence, the correct term for these rays is "direct rays".
