6th Class Science Light, Shadows and Reflections

Light, Shadows and Reflections

Category : 6th Class

Light, Shadows and Reflection

 

Synopsis

 

 

  • Objects which emit light energy by themselves are called luminous bodies.

          e.g., the sun, the stars, and glow worms.

  •  The bodies which do not have light energy of their own but reflect the light energy falling on them and hence are visible to us are called non-luminous bodies.

         e.g., the moon, objects around us, books, chairs, buildings, trees, etc.

 

  • The moon appears bright due to the reflection of sunlight falling on it.

 

  • Transparent bodies are substances through which light is propagated easily,

          e.g., glass/water/etc.

 

  • Translucent bodies are substances through which light is propagated partially.

          e.g., oil, ground glass, etc.

 

  • Opaque bodies are substances through which light is not propagated.

         e.g., wood, iron, etc.

 

  • Light travels in straight lines.

 

  • Smooth surfaces like mirrors form images.

 

  • The shadow of an object is formed because of the rectilinear propagation of light. A shadow is the area of darkness formed on the screen, when an opaque body is placed in between the screen and a source of light

 

  • A pin hole camera uses the principle of rectilinear propagation of light. It produces a real image which is much smaller than the object and is inverted (upside down).

 

 

 

 

  •  The returning of a light ray passing through an optical medium into the same medium from the surface of the second medium is called the reflection of light.

 

  • The surfaces which reflect light are called reflecting surfaces.
  •  Images are different from shadows.

Notes - Light, Shadows and Reflections
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