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. How does light travel through a uniform medium such as air or vacuum: in straight lines, or in curved loops?
Light Ray (Straight Line) · Angle i = Angle r
2. 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
3. What astronomical event occurs when the Moon passes directly between the Sun and Earth, casting a shadow on Earth: a solar eclipse or a lunar eclipse?
Light Ray (Straight Line) · Angle i = Angle r
4. What happens to the size of an object’s shadow on a wall when the object is moved closer to the small light source: the shadow gets larger, or the shadow disappears?
Light Ray (Straight Line) · Angle i = Angle r
5. 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
6. What optical instrument uses two mirrors angled at 45° inside a tube to let an observer see over obstacles: a periscope or a stethoscope?
Light Ray (Straight Line) · Angle i = Angle r
7. Which of these is a luminous object (emits its own light): the Sun or the Moon?
Light Ray (Straight Line) · Angle i = Angle r
8. Why can sound NOT travel through the vacuum of outer space whereas light can: sound is a mechanical wave that needs vibrating particles, or space is too cold?
Light Ray (Straight Line) · Angle i = Angle r
9. 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
10. Why does a red apple appear red in white daylight: it reflects red light and absorbs other colours, or it absorbs only red light?
Light Ray (Straight Line) · Angle i = Angle r
11. Why do people often wear light-coloured or white clothing in hot sunny weather: white surfaces reflect most sunlight and stay cooler, or white absorbs all heat?
Light Ray (Straight Line) · Angle i = Angle r
12. 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

12 questions · Seed 68 · 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. How does light travel through a uniform medium such as air or vacuum: in straight lines, or in curved loops?
In straight lines
Light rays travel in straight lines in a uniform medium.
2. 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.
3. What astronomical event occurs when the Moon passes directly between the Sun and Earth, casting a shadow on Earth: a solar eclipse or a lunar eclipse?
Solar eclipse
During a solar eclipse, the Moon blocks sunlight from reaching part of Earth.
4. What happens to the size of an object’s shadow on a wall when the object is moved closer to the small light source: the shadow gets larger, or the shadow disappears?
The shadow gets larger
Closer to the light source, the object blocks a wider cone of diverging light rays.
5. 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).
6. What optical instrument uses two mirrors angled at 45° inside a tube to let an observer see over obstacles: a periscope or a stethoscope?
Periscope
A periscope reflects light twice through 90° using two parallel 45° mirrors.
7. 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.
8. Why can sound NOT travel through the vacuum of outer space whereas light can: sound is a mechanical wave that needs vibrating particles, or space is too cold?
Sound is a mechanical wave that needs vibrating particles
Sound waves require a medium (solid, liquid or gas) to transmit vibrations.
9. 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.
10. Why does a red apple appear red in white daylight: it reflects red light and absorbs other colours, or it absorbs only red light?
It reflects red light and absorbs other colours
Pigments in the apple skin reflect red wavelengths to our eyes and absorb the rest of the spectrum.
11. Why do people often wear light-coloured or white clothing in hot sunny weather: white surfaces reflect most sunlight and stay cooler, or white absorbs all heat?
White surfaces reflect most sunlight and stay cooler
White and shiny surfaces reflect most incident radiation, whereas matt black surfaces absorb it.
12. 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).

12 questions · Seed 68 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Light, reflection & shadows

Take your time. Show your thinking.

1. How does light travel through a uniform medium such as air or vacuum: in straight lines, or in curved loops?
Light Ray (Straight Line) · Angle i = Angle r
2. 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
3. What astronomical event occurs when the Moon passes directly between the Sun and Earth, casting a shadow on Earth: a solar eclipse or a lunar eclipse?
Light Ray (Straight Line) · Angle i = Angle r
4. What happens to the size of an object’s shadow on a wall when the object is moved closer to the small light source: the shadow gets larger, or the shadow disappears?
Light Ray (Straight Line) · Angle i = Angle r
5. 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
6. What optical instrument uses two mirrors angled at 45° inside a tube to let an observer see over obstacles: a periscope or a stethoscope?
Light Ray (Straight Line) · Angle i = Angle r
7. Which of these is a luminous object (emits its own light): the Sun or the Moon?
Light Ray (Straight Line) · Angle i = Angle r
8. Why can sound NOT travel through the vacuum of outer space whereas light can: sound is a mechanical wave that needs vibrating particles, or space is too cold?
Light Ray (Straight Line) · Angle i = Angle r
9. 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
10. Why does a red apple appear red in white daylight: it reflects red light and absorbs other colours, or it absorbs only red light?
Light Ray (Straight Line) · Angle i = Angle r
11. Why do people often wear light-coloured or white clothing in hot sunny weather: white surfaces reflect most sunlight and stay cooler, or white absorbs all heat?
Light Ray (Straight Line) · Angle i = Angle r
12. 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

12 questions · Seed 68 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 7-9

Light, reflection & shadows

Answers and reasoning. Review before teaching.

1. How does light travel through a uniform medium such as air or vacuum: in straight lines, or in curved loops?
In straight lines
Light rays travel in straight lines in a uniform medium.
2. 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.
3. What astronomical event occurs when the Moon passes directly between the Sun and Earth, casting a shadow on Earth: a solar eclipse or a lunar eclipse?
Solar eclipse
During a solar eclipse, the Moon blocks sunlight from reaching part of Earth.
4. What happens to the size of an object’s shadow on a wall when the object is moved closer to the small light source: the shadow gets larger, or the shadow disappears?
The shadow gets larger
Closer to the light source, the object blocks a wider cone of diverging light rays.
5. 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).
6. What optical instrument uses two mirrors angled at 45° inside a tube to let an observer see over obstacles: a periscope or a stethoscope?
Periscope
A periscope reflects light twice through 90° using two parallel 45° mirrors.
7. 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.
8. Why can sound NOT travel through the vacuum of outer space whereas light can: sound is a mechanical wave that needs vibrating particles, or space is too cold?
Sound is a mechanical wave that needs vibrating particles
Sound waves require a medium (solid, liquid or gas) to transmit vibrations.
9. 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.
10. Why does a red apple appear red in white daylight: it reflects red light and absorbs other colours, or it absorbs only red light?
It reflects red light and absorbs other colours
Pigments in the apple skin reflect red wavelengths to our eyes and absorb the rest of the spectrum.
11. Why do people often wear light-coloured or white clothing in hot sunny weather: white surfaces reflect most sunlight and stay cooler, or white absorbs all heat?
White surfaces reflect most sunlight and stay cooler
White and shiny surfaces reflect most incident radiation, whereas matt black surfaces absorb it.
12. 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).

12 questions · Seed 68 · Age guidance, not curriculum certification