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Refraction- Optical Illusions

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muskan jaitly

on 13 November 2014

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Transcript of Refraction- Optical Illusions


Purpose: to show how the human eyes are tricked into believing the coin disappeared due to refraction
3 Types of Optical Illusions:
Materials used:
Salt Water
Tap Water

To show how the human eye is tricked into seeing a pencil bend and break due to refraction
Optical Illusions Demonstrations
Refraction - Optical Illusions
By: Muskan K, Hita R & Randip B
What are optical illusions?
Optical Illusion in Relation to Refraction
The Breaking Pencil
The Disappearing Coin
How it works:
Light rays above water level are normal so pencil is seen exactly as it is.
light rays enter the tap water level --> we see the pencil getting "bent"
human brain projects into a straight line and we see the new pencil.
The pencil "breaks" as it enters the salty water level.
optical density of the salty water changes the light refraction even more than compared to the the tap water
How it works:
When coin i
Some optical illusions happen because of refraction.
The human brain always perceives light to travel in a straight line
Our human brain projects the refracted ray backwards to a virtual light source.

Optical Illusions use color, light and patterns to create images that can be misleading to our brains
Information is gathered by human eye and is processed by the brain, creating an image that in reality does not match the real image
Where are optical illusions used?
Rubber hand illusion – to feel that the rubber hand is their own hand.
Hallucination and illusion theories - these are used in arts and architecture.
Honda- for their advertisements
Greeks architects used optical illusions to stimulate perfection
Why coin disappeared:
4 mediums
too much refraction
brain perceives coin disappeared
It reflects back to our optics units, by showing us how refraction occurs and causes optical illusion.
Works Cited
Optical illusions:
Literal optical illusions: creates images that are different from the objects that make them
Physiological illusions: effects of excessive stimulation of a specific type (brightness, color, size, position, tilt, movement)
Cognitive illusions: where the eyes and brain make unconscious inferences.
Adam-Carr, Christine. Nelson Science Perspectives 10. Toronto, Ontario: Nelson
Education, 2010. Print.

"Honda Uses Optical Illusions To Tease Your Brain In Amazing New Ad." Digital
Synopsis. N.p., n.d. Web. 11 Nov. 2014. <http://digitalsynopsis.com/advertising/honda-crv-impossible-illusions/>

"How Are Visual Illusions Used in Medicine and Arts and What Was Their Role in
History?" University of Leicester, n.d. Web. 11 Nov. 2014. <http://www2.le.ac.uk/offices/press/press-releases/2013/may/how-are-visual- illusions-used-in-medicine-and-arts-and-what-was-their-role-in-history>.

J.D.G. "Science Experiments about Light for Kids." Education Space 360. N.p., 5 Nov.
2009. Web. 11 Nov. 2014. <http%3A%2F%2Fwww.educationspace360.com%2Findex.php%2Fscience-experiments-about-light-for-kids-13504%2F>.

"Optical Illusion." Princeton University. N.p., n.d. Web. 11 Nov. 2014. <http://

"What Is an Optical Illusion?" Optics 4 Kids. University of Rochester, USA, n.d. Web.
11 Nov. 2014. <http://www.optics4kids.org/home/content/illusions/>.

Wood, Christina. "Ask a Physicist Answers." Ask a Physicist Answers. N.p., n.d. Web.
11 Nov. 2014. <http://physicscentral.com/experiment/askaphysicist/physics-answer.cfm?uid=20101216091531>.
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