Educational worksheet for Unit 4: Light and Dark, including activities on identifying light sources, reflecting objects, true/false statements, and understanding light reflection.

Let's go through each task in the worksheet "Unit 4: Light and Dark" step by step and solve it with explanations.

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✔ Task A. (1) Tick (√) the sources of light.

We need to identify which objects produce their own light.

- Candle → Yes, a burning candle produces light. ✔
- Wall → No, a wall does not produce light; it only reflects light. ✘
- Sun → Yes, the sun is a natural source of light. ✔
- Lamp → Yes, an electric lamp produces light when turned on. ✔

✔ Answer: Tick the candle, sun, and lamp.

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✔ Task A. (2) Recall the reflection activity and tick the objects that reflect the light.

Reflection means light bounces off a surface.

- Bear → No, a bear’s fur absorbs and scatters light but doesn’t clearly reflect it like a mirror. ✘
- Mirror → Yes, mirrors are designed to reflect light clearly. ✔
- Whiteboard → Yes, whiteboards reflect light (that’s why we can see writing on them). ✔
- Book → A book may reflect some light, but not as clearly as a mirror or whiteboard. However, since it has a smooth surface, it does reflect light (especially if it's glossy). But in basic science terms for kids, books are generally not considered strong reflectors unless specified. So likely ✘ unless it's shiny.
→ In this context, mirror and whiteboard are the best choices.

✔ Answer: Tick the mirror and whiteboard.

> Note: A book might reflect some light, but not enough to be considered a good reflector compared to a mirror or whiteboard.

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✔ Task B. (1) True or False

1. We can see in the dark.
→ No, we cannot see in complete darkness because there is no light.
✘ False

2. Glass is a source of light.
→ Glass does not produce light. It may transmit or reflect light, but it’s not a source.
✘ False

3. We can see the things because of reflection of light.
→ Yes! We see objects because light reflects off them and enters our eyes.
✔ True

✔ Answers:
1. False
2. False
3. True

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✔ Task B. (2) Choose the correct answer for the following blanks.

1. We can see because of reflection of _________. (dark, light)
→ We see because light reflects from objects into our eyes.
✔ light

2. When light bounces ________ when it hits something (back, stop)
→ Light bounces back when it hits a surface — this is called reflection.
✔ back

✔ Answers:
1. light
2. back

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📝 Final Answers Summary:

#### Task A. (1): Sources of light
- ✔ Candle
- ✘ Wall
- ✔ Sun
- ✔ Lamp

#### Task A. (2): Objects that reflect light
- ✘ Bear
- ✔ Mirror
- ✔ Whiteboard
- ✘ Book

#### Task B. (1): True or False
1. False
2. False
3. True

#### Task B. (2): Fill in the blanks
1. light
2. back

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This worksheet teaches foundational concepts about light sources, reflection, and how we see things. The key idea is:
> 🔍 We see objects because light reflects off them into our eyes. Only luminous objects (like the sun, candle, lamp) produce their own light. Non-luminous objects (like walls, books) are seen due to reflected light.

Let me know if you'd like this printed or formatted as a completed worksheet!