Reflection of light- A review Worksheet - Free Printable

Let's solve the Science 8 – Reflection & Refraction Worksheet step by step. I'll fill in the blanks and match the terms with their correct descriptors using the vocabulary provided.

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Vocabulary Box:

- Incidence
- Opaque
- Reflected ray
- Refraction
- Material
- Plane mirror
- Reflection
- Transparent
- Normal
- Ray model of light
- Refracted ray
- Translucent

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Questions 1–8: Fill in the Blanks

#### 1) In the ________, light is described as a ray that travels in a straight path.

✔ Answer: *Ray model of light*
> The "ray model of light" simplifies light as rays that travel in straight lines until they interact with surfaces or materials.

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#### 2) When light strikes ________ materials, it passes through them.

✔ Answer: *Transparent*
> Transparent materials (like glass or clear water) allow light to pass through clearly without scattering.

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#### 3) When light strikes ________ materials, it passes through them but is scattered from its straight path.

✔ Answer: *Translucent*
> Translucent materials (like frosted glass or wax paper) let light through but scatter it, so objects don't appear clear.

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#### 4) ________ materials do not allow light to pass through them.

✔ Answer: *Opaque*
> Opaque materials (like wood or metal) block light completely.

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#### 5) The angle of reflection is equal to the angle of ________.

✔ Answer: *Incidence*
> This is one of the laws of reflection: the angle of incidence = angle of reflection.

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#### 6) Light rays bounce off a ________ with a regular reflecting pattern.

✔ Answer: *Plane mirror*
> A plane mirror has a flat surface and reflects light regularly (not diffusely), producing a clear image.

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#### 7) The angle of ________ is the angle of a light ray that comes out of the boundary between two materials.

✔ Answer: *Refraction*
> Wait — this sentence says “the angle of ________ is the angle...”, so we need a term for an angle. But “refraction” is a process, not an angle.

Actually, the correct answer should be:

✔ Answer: *Refraction* → No, that doesn’t fit grammatically.

Wait — let’s re-read:

> "The angle of ________ is the angle of a light ray that comes out of the boundary between two materials."

This is describing the angle of refraction, which is the angle between the refracted ray and the normal.

But the blank is asking for the term used to describe that angle.

So the correct term is:

✔ Answer: *Refraction*? No — again, it's not the process.

Actually, the correct term is "refraction" — but the phrase is "the angle of refraction".

But the question says: "The angle of ________ is..." — so we're looking for a noun that completes this.

So the best answer is:

✔ Answer: *Refraction*

But wait — the angle of refraction is defined as the angle the refracted ray makes with the normal after passing into a new medium.

So yes, the angle of refraction is the angle of the light ray coming out.

Therefore, the blank should be filled with:

✔ Answer: *Refraction* — because “angle of refraction” is the correct term.

So:

> The angle of refraction is the angle of a light ray that comes out of the boundary between two materials.

✔️ Correct.

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#### 8) The angle of refraction is measured between the ________ and the normal.

✔ Answer: *Refracted ray*
> By definition, the angle of refraction is the angle between the refracted ray and the normal.

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Question 9: Match each Term on the left with the best Descriptor on the right

| Term | Descriptor |
|-----------------------|----------|
| Normal | D. Imaginary line that passes through materials at right angle |
| Angle of refraction | B. Measured between the refracted ray and the normal |
| Angle of reflection | C. Angle of reflected ray |
| Angle of incidence | A. Equal to the angle of reflection |

Let’s go through each:

- Normal: An imaginary line perpendicular (at right angles) to the surface at the point of incidence.
→ Matches D

- Angle of refraction: The angle between the refracted ray and the normal.
→ Matches B

- Angle of reflection: The angle between the reflected ray and the normal.
→ So it's the "angle of reflected ray" → matches C

- Angle of incidence: The angle between the incident ray and the normal.
→ According to the law of reflection, it equals the angle of reflection → matches A

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✔ Final Answers:

#### Fill-in-the-blank Questions:

1) In the ray model of light, light is described as a ray that travels in a straight path.
2) When light strikes transparent materials, it passes through them.
3) When light strikes translucent materials, it passes through them but is scattered from its straight path.
4) Opaque materials do not allow light to pass through them.
5) The angle of reflection is equal to the angle of incidence.
6) Light rays bounce off a plane mirror with a regular reflecting pattern.
7) The angle of refraction is the angle of a light ray that comes out of the boundary between two materials.
8) The angle of refraction is measured between the refracted ray and the normal.

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#### Matching Question:

| Term | Descriptor |
|-----------------------|----------|
| Normal | D |
| Angle of refraction | B |
| Angle of reflection | C |
| Angle of incidence | A |

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📝 Summary:

This worksheet tests understanding of basic optics concepts like reflection, refraction, types of materials (transparent, translucent, opaque), and key definitions related to angles and rays.

All answers are based on standard physics terminology and the vocabulary provided.

Let me know if you'd like a printable version or explanations for any concept!