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Light & Optics treasure hunt

Delve into the wonderful world of light and optics with our interactive GPS scavenger hunts. Discover how rainbows are created, experiment with mirrors and lenses, and understand the laws of nature that determine colours and shadows.

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Made 2 days ago: Enkhuizen city walk in Enkhuizen

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Featured this week: example questions for Light & Optics

New example questions from the library every Monday. Updated on 12 October 2026.

What do you see in a rainbow after the rain?
All colours mixed together Red and blue only Black and white only Yellow only
What happens when you turn on a torch under your duvet?
The duvet is illuminated The duvet gets cold The duvet turns blue The duvet gets wet
What colour do you see when you mix all the colours lightly?
White Black Green Yellow
What do you see when you look at your hand with a red lamp?
A red hand A green hand A blue hand A purple hand
What do you see when you look through coloured glasses?
Everything gets that colour Everything goes white Everything gets big Nothing
What do you need to see your shadow?
Light Water Music Food
What happens when you look for a black cat in the dark?
You can't see the cat properly The cat turns white The cat grows up The cat starts barking
What do you see when it is very dark?
Almost nothing All very well Red only Blue only
Create a light & optics treasure hunt for Ages 3-4
How can you make a rainbow with the garden hose?
By spraying water in the sun By painting the snake blue By spraying very hard By using cold water
Which insect makes light in the dark?
A firefly An ant A butterfly A spider
What happens to your shadow when the sun is higher?
Your shadow is getting shorter Your shadow grows longer Your shadow becomes greener Your shadow is going to dance
What happens when you view a red cell through red glass?
The cell remains red The cell turns blue The cell turns black The cell disappears
What happens when you shine a torch on a red apple?
The apple looks redder The apple turns blue The apple becomes transparent The apple will float
What happens if you shine green light on a red rose?
The rose looks dark The rose grows greener The rose becomes yellower The rose will glow
What colour does sunlight actually have?
All colours together Yellow only Blue only Red only
Why can you see through glass?
Glass lets light through Glass makes noise Glass is always cold Glass smells nice
Create a light & optics treasure hunt for Ages 5-6
How to create a rainbow in the garden with a garden hose?
By sunlight and water drops Through the hose itself Through the garden soil Through the plants
What happens when you hold a CD in sunlight?
You see rainbow colours The CD gets warm The CD breaks Music comes out
Why does a star flash in the sky?
As the sky moves Because the star goes on and off Because your eyes are tired Because the star is near
Which object makes a shadow?
An opaque ball A glass vase A light Air
Where does light travel fastest?
In space In water In glass In wood
Why is a white wall illuminated by a torch?
Because white light reflects back Because the wall makes light Because white light absorbs Because the torch is white
Which colour do you see last in a rainbow?
Purple Red Yellow Green
Why does water glisten in the sun?
Because it reflects light Because water is blue Because water is wet Because water gets hot
Create a light & optics treasure hunt for Ages 7-8
How does a periscope work?
With two mirrors that bend light With one big lens that magnifies everything With a very long tube without parts With coloured glasses
Why do shadows get longer the lower the sun is?
Because the light falls at a more oblique angle As the sun gets weaker Because objects appear larger As the ground softens
How can a glass of water act as a magnifying glass?
The round glass bends light like a lens Water makes everything bigger Glass attracts objects to itself Due to air bubbles in the water
What is a camera obscura?
A dark room with a small hole that projects images A very big camera A mirror that stores images A lamp that gives very bright light
What is the difference between transparent and translucent?
Through transparent you see sharp, through translucent blurred Transparent is thinner than translucent Translucent is always white in colour There is no difference between the two
What is an optical illusion?
When your eyes see something different from reality When you can't see well without glasses When light is too bright When your eyes are tired
What object uses light to magnify something?
A magnifying glass A torch A mirror A lamp
What colour is created when you mix red and green light?
Yellow Purple Orange Brown
Create a light & optics treasure hunt for Ages 11-12
How fast does light move in a vacuum?
300,000,000 metres per second 150,000,000 metres per second 450,000,000 metres per second 250,000,000 metres per second
What phenomenon makes fibre-optic communication possible?
Total internal reflection Refraction Light absorption Light diffraction
What happens to light when it goes from air into water?
It breaks down to normal It breaks down from the normal It goes straight ahead without deflection It is fully reflected
What is the complementary colour of red light?
Cyan Green Blue Magenta
What phenomenon explains why a spoon looks broken in a glass of water?
Refraction Light reflection Light absorption Light diffraction
What is the difference between fluorescence and phosphorescence?
Phosphorescence persists longer after exposure Fluorescence is always greener Phosphorescence is brighter There is no difference
Which colour absorbs the most sunlight?
Black White Yellow Silver
What is the angle of incidence if the rebound angle is 30°?
30° 60° 15° 45°
Create a light & optics treasure hunt for Ages 13-14
What determines the strength (dioptre) of a lens?
The inverse of the focal length in metres The diameter of the lens The refractive index of the lens material The thickness of the lens
Which lens corrects farsightedness (presbyopia)?
Converging lens Divergent lens Cylindrical lens Bifocal lens
Which lens has a positive focal length?
Converging lens Divergent lens Cylindrical lens Concave lens
Which property determines the colour of light?
Frequency Amplitude Speed Intensity
What is the phenomenon called in which light waves bend around an obstacle?
Diffraction Refraction Reflection Interference
Which lens always produces a reduced, upright, virtual image?
Concave lens Convex lens Cylindrical lens Bifocal lens
Why does the sky look blue?
Rayleigh scattering scatters blue light more than red light The oceans reflect blue light into the atmosphere Nitrogen molecules absorb all colours except blue Sunlight contains mainly blue light
What is the effect called in which light transfers energy to electrons?
Photoelectric effect Compton effect Doppler effect Zeeman effect
Create a light & optics treasure hunt for Ages 15-16
What is the Doppler shift for light?
Change in frequency due to relative motion Change in amplitude due to interference Change in polarisation due to magnetic fields Change in coherence due to scattering
What is the reason glass is transparent to visible light?
Photons have insufficient energy for electron transitions Glass has a perfect crystal structure The atoms in glass are too small Glass reflects all colours evenly
Which mirror is used as the main mirror in most large telescopes?
Parabolic concave mirror Spherical concave mirror Flat mirror Spherical mirror
Which lens aberration causes different focal points for different colours?
Chromatic aberration Spherical aberration Astigmatism Distortion
What happens to light intensity when the distance to a point source doubles?
Becomes four times smaller Becomes twice smaller Remains the same Becomes eight times smaller
What type of aberration is corrected by an aplanatic lens?
Spherical aberration and coma Chromatic aberration and astigmatism Distortion and field curvature Chromatic aberration only
What is the focal length of a lens with prescription +2 dioptres?
0.5 metres 2 metres 0.2 metres 1 metre
What happens to the wavelength of light when it goes from air into water?
The wavelength gets shorter The wavelength gets longer The wavelength remains the same The wavelength disappears completely
Create a light & optics treasure hunt for Ages 17-18
What is the function of a beamsplitter?
Division of beam into two parts Magnification of beam diameter Filtering of specific frequencies Conversion from divergent to parallel beam
What effect occurs in the magneto-optical Kerr effect?
Rotation of polarisation plane by magnetic field Change of refractive index due to electric field Frequency shift due to motion Splitting of spectral lines
What is the focal length of a hollow mirror with radius of curvature 20 cm?
10 cm 20 cm 40 cm 5 cm
Which property of light is used in optical tweezers?
Radiation pressure Magnetic moment Electrical charge Heat development
What phenomenon explains the effect of a rainbow?
Refraction and internal reflection in water droplets Diffraction to ice crystals Interference in the atmosphere Polarization by dust particles
What effect occurs when light passes through a rotating medium?
Fizeau effect Faraday effect Kerr effect Pockels effect
At which wavelength does the human eye have the highest sensitivity?
555 nanometres 480 nanometres 650 nanometres 420 nanometres
Which type of microscope uses electron beams instead of light?
Transmission electron microscope Confocal microscope Fluorescence microscope Darkfield microscope
Create a light & optics treasure hunt for Ages 18+

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Frequently asked questions

A Light & Optics scavenger hunt is a GPS-guided outdoor activity with quiz questions about Light & Optics, part of the theme Physics. You walk a route past various locations and answer fun questions along the way.

There are 2991 questions available about Light & Optics: 2991 multiple choice questions, 0 open questions and 0 assignments. The category Physics has more than 50187 questions in total.

There are Light & Optics questions for all ages: from 3-5 years (toddlers) to 20+ (adults). The questions are automatically adapted to the chosen level.

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