ScienceAges 7-9

Light, reflection & shadows

Explore how light travels in straight lines, reflects from mirrors and forms shadows behind opaque objects. Review suitability for your learners before teaching.

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Worksheet StudioPractice pack · Ages 7-9

Light, reflection & shadows

Take your time. Show your thinking.

1. Which of these is a luminous object (emits its own light): the Sun or the Moon?
Light Ray (Straight Line) · Angle i = Angle r
2. Why does a smooth mirror form a clear image while white paper does not: specular reflection vs diffuse scattering, or paper absorbs all light?
Light Ray (Straight Line) · Angle i = Angle r
3. How do we see a non-luminous object such as a printed book page: light from a source reflects off the page into our eyes, or our eyes send out beams?
Light Ray (Straight Line) · Angle i = Angle r
4. Why does a straight pencil standing partly in a glass of water look bent at the water surface: refraction of light rays leaving the water, or the water bends the wood?
Light Ray (Straight Line) · Angle i = Angle r
5. Which part of the human eye is the dark circular opening at the centre of the iris that lets light enter: the pupil or the eyebrow?
Light Ray (Straight Line) · Angle i = Angle r
6. If a light ray strikes a flat mirror at an angle of incidence of 35° to the normal, what is the angle of reflection: 35° or 55°?
Light Ray (Straight Line) · Angle i = Angle r
7. In which medium does light travel fastest: in a vacuum (space) or in diamond?
Light Ray (Straight Line) · Angle i = Angle r
8. What type of lens is thicker in the middle than at the edges and brings parallel light rays together to a focal point: a convex (converging) lens or a concave lens?
Light Ray (Straight Line) · Angle i = Angle r
9. According to the law of reflection on a flat plane mirror, how does the angle of reflection compare to the angle of incidence: they are equal, or the angle of reflection is twice as large?
Light Ray (Straight Line) · Angle i = Angle r
10. Does light require a material medium (like air) to travel, or can it travel through the vacuum of space?
Light Ray (Straight Line) · Angle i = Angle r
11. What is the imaginary line drawn at 90° (perpendicular) to a mirror surface at the point where a light ray strikes called: the normal or the tangent?
Light Ray (Straight Line) · Angle i = Angle r
12. At what time of day are outdoor shadows cast by the Sun shortest: around midday (noon) when the Sun is highest in the sky, or at sunrise?
Light Ray (Straight Line) · Angle i = Angle r

12 questions · Seed 49 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 7-9

Light, reflection & shadows

Answers and reasoning. Review before teaching.

1. Which of these is a luminous object (emits its own light): the Sun or the Moon?
The Sun
The Sun generates and emits light; the Moon is non-luminous and only reflects sunlight.
2. Why does a smooth mirror form a clear image while white paper does not: specular reflection vs diffuse scattering, or paper absorbs all light?
Specular reflection vs diffuse scattering
A smooth mirror reflects parallel rays in one direction (specular), whereas rough paper scatters rays in all directions (diffuse).
3. How do we see a non-luminous object such as a printed book page: light from a source reflects off the page into our eyes, or our eyes send out beams?
Light from a source reflects off the page into our eyes
Vision occurs when light reflected from an object enters the eye and focuses on the retina.
4. Why does a straight pencil standing partly in a glass of water look bent at the water surface: refraction of light rays leaving the water, or the water bends the wood?
Refraction of light rays leaving the water
Light rays from the submerged part bend away from the normal as they exit water into air.
5. Which part of the human eye is the dark circular opening at the centre of the iris that lets light enter: the pupil or the eyebrow?
Pupil
The pupil is the aperture whose size is adjusted by the iris to control how much light enters the eye.
6. If a light ray strikes a flat mirror at an angle of incidence of 35° to the normal, what is the angle of reflection: 35° or 55°?
35°
By the law of reflection, angle of reflection = angle of incidence = 35°.
7. In which medium does light travel fastest: in a vacuum (space) or in diamond?
In a vacuum (space)
Light reaches its maximum speed c ≈ 3 × 10⁸ m/s in a vacuum and slows down in optically denser materials.
8. What type of lens is thicker in the middle than at the edges and brings parallel light rays together to a focal point: a convex (converging) lens or a concave lens?
Convex (converging) lens
A convex lens converges parallel rays to a focus and is used in magnifying glasses.
9. According to the law of reflection on a flat plane mirror, how does the angle of reflection compare to the angle of incidence: they are equal, or the angle of reflection is twice as large?
They are equal
The angle of incidence always equals the angle of reflection (measured from the normal).
10. Does light require a material medium (like air) to travel, or can it travel through the vacuum of space?
It can travel through the vacuum of space
Light is an electromagnetic wave and travels through vacuum at about 300,000 km/s.
11. What is the imaginary line drawn at 90° (perpendicular) to a mirror surface at the point where a light ray strikes called: the normal or the tangent?
The normal
Angles of incidence and reflection are always measured relative to the normal (90° to the surface).
12. At what time of day are outdoor shadows cast by the Sun shortest: around midday (noon) when the Sun is highest in the sky, or at sunrise?
Around midday (noon) when the Sun is highest in the sky
When the Sun is high overhead, rays strike steeply and cast short shadows.

12 questions · Seed 49 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Light, reflection & shadows

Take your time. Show your thinking.

1. Which of these is a luminous object (emits its own light): the Sun or the Moon?
Light Ray (Straight Line) · Angle i = Angle r
2. Why does a smooth mirror form a clear image while white paper does not: specular reflection vs diffuse scattering, or paper absorbs all light?
Light Ray (Straight Line) · Angle i = Angle r
3. How do we see a non-luminous object such as a printed book page: light from a source reflects off the page into our eyes, or our eyes send out beams?
Light Ray (Straight Line) · Angle i = Angle r
4. Why does a straight pencil standing partly in a glass of water look bent at the water surface: refraction of light rays leaving the water, or the water bends the wood?
Light Ray (Straight Line) · Angle i = Angle r
5. Which part of the human eye is the dark circular opening at the centre of the iris that lets light enter: the pupil or the eyebrow?
Light Ray (Straight Line) · Angle i = Angle r
6. If a light ray strikes a flat mirror at an angle of incidence of 35° to the normal, what is the angle of reflection: 35° or 55°?
Light Ray (Straight Line) · Angle i = Angle r
7. In which medium does light travel fastest: in a vacuum (space) or in diamond?
Light Ray (Straight Line) · Angle i = Angle r
8. What type of lens is thicker in the middle than at the edges and brings parallel light rays together to a focal point: a convex (converging) lens or a concave lens?
Light Ray (Straight Line) · Angle i = Angle r
9. According to the law of reflection on a flat plane mirror, how does the angle of reflection compare to the angle of incidence: they are equal, or the angle of reflection is twice as large?
Light Ray (Straight Line) · Angle i = Angle r
10. Does light require a material medium (like air) to travel, or can it travel through the vacuum of space?
Light Ray (Straight Line) · Angle i = Angle r
11. What is the imaginary line drawn at 90° (perpendicular) to a mirror surface at the point where a light ray strikes called: the normal or the tangent?
Light Ray (Straight Line) · Angle i = Angle r
12. At what time of day are outdoor shadows cast by the Sun shortest: around midday (noon) when the Sun is highest in the sky, or at sunrise?
Light Ray (Straight Line) · Angle i = Angle r

12 questions · Seed 49 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 7-9

Light, reflection & shadows

Answers and reasoning. Review before teaching.

1. Which of these is a luminous object (emits its own light): the Sun or the Moon?
The Sun
The Sun generates and emits light; the Moon is non-luminous and only reflects sunlight.
2. Why does a smooth mirror form a clear image while white paper does not: specular reflection vs diffuse scattering, or paper absorbs all light?
Specular reflection vs diffuse scattering
A smooth mirror reflects parallel rays in one direction (specular), whereas rough paper scatters rays in all directions (diffuse).
3. How do we see a non-luminous object such as a printed book page: light from a source reflects off the page into our eyes, or our eyes send out beams?
Light from a source reflects off the page into our eyes
Vision occurs when light reflected from an object enters the eye and focuses on the retina.
4. Why does a straight pencil standing partly in a glass of water look bent at the water surface: refraction of light rays leaving the water, or the water bends the wood?
Refraction of light rays leaving the water
Light rays from the submerged part bend away from the normal as they exit water into air.
5. Which part of the human eye is the dark circular opening at the centre of the iris that lets light enter: the pupil or the eyebrow?
Pupil
The pupil is the aperture whose size is adjusted by the iris to control how much light enters the eye.
6. If a light ray strikes a flat mirror at an angle of incidence of 35° to the normal, what is the angle of reflection: 35° or 55°?
35°
By the law of reflection, angle of reflection = angle of incidence = 35°.
7. In which medium does light travel fastest: in a vacuum (space) or in diamond?
In a vacuum (space)
Light reaches its maximum speed c ≈ 3 × 10⁸ m/s in a vacuum and slows down in optically denser materials.
8. What type of lens is thicker in the middle than at the edges and brings parallel light rays together to a focal point: a convex (converging) lens or a concave lens?
Convex (converging) lens
A convex lens converges parallel rays to a focus and is used in magnifying glasses.
9. According to the law of reflection on a flat plane mirror, how does the angle of reflection compare to the angle of incidence: they are equal, or the angle of reflection is twice as large?
They are equal
The angle of incidence always equals the angle of reflection (measured from the normal).
10. Does light require a material medium (like air) to travel, or can it travel through the vacuum of space?
It can travel through the vacuum of space
Light is an electromagnetic wave and travels through vacuum at about 300,000 km/s.
11. What is the imaginary line drawn at 90° (perpendicular) to a mirror surface at the point where a light ray strikes called: the normal or the tangent?
The normal
Angles of incidence and reflection are always measured relative to the normal (90° to the surface).
12. At what time of day are outdoor shadows cast by the Sun shortest: around midday (noon) when the Sun is highest in the sky, or at sunrise?
Around midday (noon) when the Sun is highest in the sky
When the Sun is high overhead, rays strike steeply and cast short shadows.

12 questions · Seed 49 · Age guidance, not curriculum certification