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Home » Holiday Science » Halloween Science » Disappearing Spiders – Halloween Refraction Experiment

Disappearing Spiders – Halloween Refraction Experiment

Published: Oct 2, 2024 by Emma Vanstone · This post may contain affiliate links · Leave a Comment

This disappearing spider trick is a simple Halloween science activity and a great refraction demonstration.

Children can watch as a drawing of a spider disappears when water is poured into a glass over the image.

disappearing spider refraction trick
Glass half filled with water. A drawing of a spider under the glass is no longer visible

Disappearing Spider Trick

You’ll need

Glass cup or jar
Drawing of a spider on a sheet of paper
Water

Instructions

Place a drawing of a spider under the glass.

Slowly fill the glass with water and watch the spider disappear.

Why does it work?

Light (from the sun or artificial light) travels in a straight line, bounces off objects, and enters our eyes, allowing us to see things. Generally, there is little or no refraction of light as it travels through air.

However, when you pour water into the glass or jar, the light from the spider drawing is refracted ( bends ) and doesn’t reach your eyes, which is why the spider seems to disappear.

FREE Experiments Instructions and Template
Template for a refraction activity


More science ideas for Halloween

Make a fizzy pumpkin lava lamp.

Try one of my other spooky Halloween Science Experiments, which include jumping ghosts, a spooky noise maker, or fake blood.

Or how about giving one of my creepy Halloween STEM challenges a go?

Disappearing Spider Refraction Trick

Last Updated on October 2, 2024 by Emma Vanstone

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Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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