Notes For All Chapters – General Science Class 6
Light and the Formation of Shadows
1. What is Light?
Light helps us see things around us.
It comes from sources like the sun, bulbs, candles, and torches.
Light travels in a straight line.
2. Types of Objects
Objects can be classified based on how they interact with light:
| Type of Object | Example | How it interacts with light? |
|---|---|---|
| Luminous objects | Sun, stars, torch, burning candle | Give out their own light |
| Non-luminous objects | Book, chair, moon, pencil | Do not produce light, but reflect it |
| Transparent objects | Glass, clean water | Allow light to pass through |
| Translucent objects | Wax paper, frosted glass | Allow some light to pass |
| Opaque objects | Wood, metal, wall | Do not allow light to pass |
3. Reflection of Light
- When light bounces back from a shiny surface like a mirror, it is called reflection.
- This helps us see ourselves in a mirror.
4. Formation of Shadows
A shadow is formed when an opaque object blocks light.
Things needed to form a shadow:
A light source (like the sun or a bulb)
An opaque object (like a book or a person)
A surface (where the shadow appears)
Shadows are always formed on the opposite side of the light source.
The shape of the shadow depends on the shape of the object.
5. Pinhole Camera
A pinhole camera is a simple device that forms an inverted image of an object.
It works on the principle that light travels in a straight line.
6. Difference Between an Object and Its Reflection
A reflection is a mirror image of an object.
It appears reversed (left side looks like the right side).
7. Natural and Artificial Light Sources
- Natural sources – Sun, stars, fireflies
- Artificial sources – Bulb, torch, candle
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