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. 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
2. 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
3. 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
4. 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
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. 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
7. 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
8. Which light-sensitive layer at the back of the human eye detects focused light and sends signals to the brain via the optic nerve: the retina or the earlobe?
Light Ray (Straight Line) · Angle i = Angle r
9. What happens when a beam of white sunlight passes through a triangular glass prism: dispersion splits it into a spectrum of colours, or it turns into sound?
Light Ray (Straight Line) · Angle i = Angle r
10. 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
11. 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
12. 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

12 questions · Seed 104732 · 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. 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.
2. 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.
3. 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.
4. 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).
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. 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.
7. 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°.
8. Which light-sensitive layer at the back of the human eye detects focused light and sends signals to the brain via the optic nerve: the retina or the earlobe?
Retina
Photoreceptor cells (rods and cones) in the retina convert light into nerve impulses.
9. What happens when a beam of white sunlight passes through a triangular glass prism: dispersion splits it into a spectrum of colours, or it turns into sound?
Dispersion splits it into a spectrum of colours
Different wavelengths of light refract by slightly different angles, dispersing white light into a rainbow spectrum.
10. 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.
11. 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.
12. 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.

12 questions · Seed 104732 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Light, reflection & shadows

Take your time. Show your thinking.

1. 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
2. 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
3. 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
4. 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
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. 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
7. 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
8. Which light-sensitive layer at the back of the human eye detects focused light and sends signals to the brain via the optic nerve: the retina or the earlobe?
Light Ray (Straight Line) · Angle i = Angle r
9. What happens when a beam of white sunlight passes through a triangular glass prism: dispersion splits it into a spectrum of colours, or it turns into sound?
Light Ray (Straight Line) · Angle i = Angle r
10. 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
11. 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
12. 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

12 questions · Seed 104732 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 7-9

Light, reflection & shadows

Answers and reasoning. Review before teaching.

1. 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.
2. 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.
3. 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.
4. 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).
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. 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.
7. 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°.
8. Which light-sensitive layer at the back of the human eye detects focused light and sends signals to the brain via the optic nerve: the retina or the earlobe?
Retina
Photoreceptor cells (rods and cones) in the retina convert light into nerve impulses.
9. What happens when a beam of white sunlight passes through a triangular glass prism: dispersion splits it into a spectrum of colours, or it turns into sound?
Dispersion splits it into a spectrum of colours
Different wavelengths of light refract by slightly different angles, dispersing white light into a rainbow spectrum.
10. 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.
11. 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.
12. 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.

12 questions · Seed 104732 · Age guidance, not curriculum certification