Light and Shadow Class 6 DAV Science Notes-Are you a Class 6 DAV Public School student looking for simple and clear notes on Light and Shadow? Don’t worry, we’ve got you covered! This blog explains Chapter 8 – Light and Shadow (Class 6 Science) in a well-structured way with important questions, answers, and give-reason explanations.
Light and Shadow Class 6 DAV Science Notes
| SL.NO | TOPIC |
| 1 | Our Environment |
| 2 | Food |
| 3 | Nature of matter |
| 4 | Separation of Substance |
| 5 | Changes around us |
| 6 | Measurement and Motion |
| 7 | The world of living |
| 8 | Structure and Function of the Living Organism-Plants |
| 9 | Structure and Function of the Living Organism-Animals |
| 10 | Work and Energy |
| 11 | Electric currents and Circuits |
| 12 | Light and Shadows |
| 13 | Magnents |
| 14 | Electric Currents and Circuits |
Light and Shadow Class 6 DAV Science Notes
1. Light
- Definition: Light is a form of energy that enables us to see objects.
- Sources of Light:
- Natural Sources: Sun, stars, firefly, glow-worm.
- Artificial Sources: Electric bulb, candle, lantern, torch.
- Luminous Objects: Objects that emit their own light. (e.g., Sun, stars, burning candle, bulb).
- Non-luminous Objects: Objects that do not emit light, but can be seen because of the light reflected from them. (e.g., chair, book, moon).
2. Properties of Light
- Light always travels in a straight line.
- Example: Beam of torch or sunlight through a small hole.
- Light can be reflected.
- Smooth surfaces like mirrors reflect light.
- Light enables us to see objects when it enters our eyes.
3. Transparent, Translucent and Opaque Objects
- Transparent Objects: Allow light to pass through completely.
- Example: Glass, clean water, air.
- Translucent Objects: Allow light to pass through partially.
- Example: Oiled paper, frosted glass, thin cloth.
- Opaque Objects: Do not allow light to pass through.
- Example: Wood, stone, wall.
4. Formation of Shadows
- Shadow: A dark patch formed behind an opaque object when it blocks the path of light.
- Conditions for formation of shadow:
- Source of light.
- Opaque object.
- Screen (on which shadow falls).
- Features of a Shadow:
- Always forms on the opposite side of the light source.
- Same shape as the object but size may change.
- Size depends on the distance between light source, object, and screen.
- If object is near the light source → bigger shadow.
- If object is away from light source → smaller shadow.
5. Differences between Shadow and Image
| Shadow | Image |
|---|---|
| Always black or grey in colour. | May be coloured (like in mirror). |
| Formed only by opaque object. | Formed by reflection or refraction. |
| Does not show details of object. | Shows details like colour and structure. |
| Always on the opposite side of light source. | Appears in front of a mirror or lens. |
6. Pinhole Camera
- Definition: A simple camera made using a box with a small pinhole on one side and a translucent screen on the opposite side.
- Working:
- Light passes through the pinhole and forms an inverted image of the object on the screen.
- Features of Image in Pinhole Camera:
- Inverted (upside down).
- Same colour as object.
- Size may be smaller or larger depending on distance.
7. Eclipses (Application of Shadow)
- Solar Eclipse:
- When the moon comes between the sun and the earth, it blocks sunlight from reaching the earth.
- Lunar Eclipse:
- When the earth comes between the sun and the moon, earth’s shadow falls on the moon.
8. Important Diagrams to Practice
- Shadow formation by opaque object.
- Pinhole camera and its working.
- Solar eclipse and lunar eclipse.
9. Key Points to Remember
- Light travels in straight line.
- Shadow is always dark regardless of the colour of the object.
- Transparent objects do not form shadows.
- Pinhole camera works on the principle of rectilinear propagation of light.
- Eclipses are natural examples of shadow formation.
Light and Shadow Class 6 DAV Science Notes -DAV Public School
Fill in the Blanks (with Answers)
- Light is a form of ______ that enables us to see objects.
Ans: energy - Objects which emit their own light are called ______ objects.
Ans: luminous - The Sun is the main source of ______ on the Earth.
Ans: light - Objects that do not emit light but can be seen when light falls on them are called ______ objects.
Ans: non-luminous - Light always travels in a ______ line.
Ans: straight - Objects that allow light to pass completely through them are called ______ objects.
Ans: transparent - Objects that allow light to pass partially through them are called ______ objects.
Ans: translucent - Objects that do not allow light to pass through them are called ______ objects.
Ans: opaque - A dark patch formed behind an opaque object when it blocks light is called a ______.
Ans: shadow - A shadow is always formed on the ______ side of the light source.
Ans: opposite - The three conditions necessary for a shadow to form are a source of light, an ______ object, and a ______.
Ans: opaque, screen - The colour of a shadow is always ______.
Ans: black (or grey) - When an object is moved closer to the light source, its shadow becomes ______.
Ans: bigger - The device that works on the principle of rectilinear propagation of light is the ______.
Ans: pinhole camera - The image formed in a pinhole camera is always ______ and ______.
Ans: inverted, real - In a pinhole camera, the size of the image depends on the distance between the ______ and the ______.
Ans: object, screen - When the Moon comes between the Sun and the Earth, a ______ eclipse occurs.
Ans: solar - When the Earth comes between the Sun and the Moon, a ______ eclipse occurs.
Ans: lunar - A mirror forms an ______ of an object by ______ of light.
Ans: image, reflection - A shadow does not show the ______ of the object.
Ans: details/colour
DAV Class 6 Light and Shadow Class 6 Science Notes
Assertion and Reason Questions (Light and Shadow Class 6 DAV Science Notes)
Q1.
Assertion (A): Light always travels in a straight line.
Reason (R): This property is called rectilinear propagation of light.
- Answer: Both A and R are true, and R is the correct explanation of A.
Q2.
Assertion (A): Transparent objects do not form shadows.
Reason (R): Transparent objects allow all the light to pass through them.
- Answer: Both A and R are true, and R is the correct explanation of A.
Q3.
Assertion (A): A shadow is always black or grey in colour.
Reason (R): A shadow is formed because an opaque object blocks the path of light.
- Answer: Both A and R are true, and R is the correct explanation of A.
Q4.
Assertion (A): A pinhole camera forms a real and inverted image.
Reason (R): The light rays entering through the small pinhole cross and form an inverted image on the screen.
- Answer: Both A and R are true, and R is the correct explanation of A.
Q5.
Assertion (A): Shadows can be formed only with opaque objects.
Reason (R): Opaque objects allow partial light to pass through.
- Answer: A is true, but R is false.
Q6.
Assertion (A): A mirror forms an image of an object.
Reason (R): Image is formed due to the reflection of light.
- Answer: Both A and R are true, and R is the correct explanation of A.
Q7.
Assertion (A): During a solar eclipse, the Earth comes between the Sun and the Moon.
Reason (R): Solar eclipse occurs when the Moon blocks sunlight from reaching the Earth.
- Answer: A is false, but R is true.
Q8.
Assertion (A): Translucent objects form faint shadows.
Reason (R): They allow only some light to pass through them.
- Answer: Both A and R are true, and R is the correct explanation of A.
Q9.
Assertion (A): The size of the shadow of an object does not change.
Reason (R): The size of the shadow depends on the distance between the object and the light source.
- Answer: A is false, but R is true.
Q10.
Assertion (A): The Moon is a luminous object.
Reason (R): It shines because it reflects the light of the Sun.
- Answer: A is false, but R is true.
DAV Public School Light and Shadow Class 6 Science Notes
Give Reason Questions & Answers(Light and Shadow Class 6 DAV Science Notes)
Q1.Shadows are always black or grey in colour.
- Answer: A shadow is formed when an opaque object blocks the path of light. Since no light reaches that part, the shadow looks black or grey, irrespective of the object’s colour.
Q2.Transparent objects do not form shadows.
- Answer: Transparent objects allow light to pass completely through them. Since light is not blocked, no shadow is formed.
Q3.Translucent objects form faint shadows.
- Answer: Translucent objects allow only part of the light to pass through, so the shadow is not completely dark but faint.
Q4.Opaque objects form shadows.
- Answer: Opaque objects do not allow light to pass through them. They block the light and hence form a shadow on the opposite side.
Q5.The image formed in a pinhole camera is inverted.
- Answer: Light travels in straight lines. The rays from the top and bottom of the object cross at the pinhole and meet at opposite positions on the screen, forming an inverted image.
Q6.The image formed in a pinhole camera can be larger or smaller than the object.
- Answer: The size of the image depends on the distance between the object and the pinhole camera. A closer object makes a larger image, while a distant object makes a smaller image.
Q7.The Moon is not a luminous body.
- Answer: The Moon does not produce its own light; it only reflects sunlight. Therefore, it is non-luminous.
Q8.We cannot see in a dark room.
- Answer: In darkness, there is no light to enter our eyes. Since objects are visible only when light reflects from them into our eyes, we cannot see them without light.
Q9.During a solar eclipse, the Sun is not visible from certain parts of the Earth.
- Answer: In a solar eclipse, the Moon comes between the Sun and the Earth. The Moon blocks sunlight from reaching those parts of the Earth, causing darkness.
Q10.During a lunar eclipse, the Moon appears dark.
- Answer: In a lunar eclipse, the Earth comes between the Sun and the Moon. The Earth blocks sunlight from reaching the Moon, so the Moon appears dark.
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