(c) What is a shadow ?
An object that blocks light from a light source creates a shadow. When light shines on an object, some of the light is absorbed, some is transmitted through the object, and some is reflected off the object’s surface. The area behind the object where the light is blocked creates a shadow.
Additional Question and Answers
Fill in the blanks:
- Light is propagated in a ………line.[ straight]
- If an opaque object obstructs the path of light, it casts a ……..[shadow]
- White sunlight contains ………..colours.[ seven]
- The material through which light passes is said to be …….[transparent]
- …….materials do not allow light to pass through them.[ Opaque]
- The term ……..refers to a material that allows light to pass partially through it.[ translucent]
- Newton wrote a book called …….about light.[ Opticks’]
In which objects do we see a reflection?
We can see reflection in any object that can reflect light. When light falls on a smooth or polished surface, it can bounce back, or reflect, to form an image. Some common examples of objects that produce reflections include: mirrors, metals and glass etc.
Give some examples of natural and artificial sources of light.
There are many natural sources of light, such as the sun, stars, fireflies, etc. Artificial light sources include lanterns, candle flames, electric bulbs, etc.
How shadow is formed?
If an opaque object comes in the way of a light source, light does not pass through it.As a result, the light does not reach a wall or any other surface on the other side of the object. That part remains dark. This dark part is called the ‘shadow of the object’.
Define luminuous objects.
Luminous objects are objects that emit or produce their own light. These objects can be natural, such as the sun, stars, and fireflies, or artificial, such as light bulbs and fireworks.
Define non luminuous objects
Non Luminuous objects are objects that do not generate their own light and depend on external sources of light to become visible. These objects can only be seen if they reflect or scatter light from another source, such as the Sun, a light bulb, or a flashlight. Examples of non-luminous objects include most everyday objects, such as rocks, buildings, and furniture, as well as astronomical objects, such as planets, moons, and asteroids.
Define artificial source of light.
An artificial source of light is a man-made device that produces light, often for the purpose of illuminating a place or object. Examples of artificial sources of light include light bulbs, fluorescent tubes, LEDs, and neon lights.
Maharashtra State Board Class 6 Science Chapter 16 The Universe
