Light, Shadows and Reflection | Class 6 : SCIENCE | CBSE / NCERT | Light, Shadows and Reflection

Recent questions

• What is light made of?

  Light is made of electromagnetic waves, which are oscillating electric and magnetic fields that travel through space. These waves can vary in wavelength and frequency, which determines the color of the light we perceive. Light can be emitted from various sources, both natural, like the sun, and artificial, like light bulbs. Understanding the nature of light is fundamental in fields such as physics and optics, as it plays a crucial role in how we see and interact with the world around us.

• How do shadows form?

  Shadows form when an opaque object blocks the path of light from a source to a surface. For a shadow to be created, three elements are necessary: a light source, an opaque object, and a surface onto which the shadow can be cast. The size and shape of the shadow depend on the position of the light source and the object. When the light is obstructed, it cannot reach the surface behind the object, resulting in a dark area that we recognize as a shadow.

• What is the difference between transparent and opaque?

  The difference between transparent and opaque materials lies in their interaction with light. Transparent materials, such as clear glass and clean water, allow light to pass through them without significant scattering, enabling us to see through them clearly. In contrast, opaque materials, like metal and wood, do not allow any light to pass through, completely blocking visibility. This fundamental distinction is essential in various applications, from designing windows to creating barriers in construction.

• How does reflection work?

  Reflection occurs when light bounces off a surface. The process involves an incident ray striking the surface at a specific point, known as the point of incidence. The angle at which the light hits the surface, called the angle of incidence, is equal to the angle at which it reflects away, known as the angle of reflection. Smooth surfaces, such as mirrors, produce regular reflection, resulting in clear images, while rough surfaces cause diffused reflection, scattering light in multiple directions and creating a less defined image.

• What are the types of light sources?

  Light sources can be categorized into two main types: natural and artificial. Natural light sources include the sun, stars, and fireflies, which emit light through various natural processes. Artificial light sources, on the other hand, are human-made and include items like candles, electric bulbs, and lasers. Each type of light source has its own characteristics and applications, influencing how we illuminate our environments and utilize light in technology and daily life.