OPTICS 01
 

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OPENING QUESTIONS: Suggest possible ways that light from different sorts of objects makes it into our optical nerve in order to be processed as an image by our brain.

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LEARNING TARGET:

 

WORDS O' THE DAY:

    • Reflection ("Lightwaves bouncing off an object")
    • Emission ("Light is given off by an object")
    • Absorbtion ("Some or all wavelengths of light are absorbed by an object")
    • Refraction ("Light waves are bent moving through a substance")
    • Angle of Incidence ("The angle a light ray takes as it moves toward a reflecting surface")
    • Angle of Reflection ("The angle a light ray takes as it moves away from a reflecting object")

WORK O' THE DAY:

Evaluate the following sentence:

All normal matter in the Universe either emits light, reflects light, refracts (bends) light or absorbs light.

Take a moment to have a quick chat with someone else in the class on those terms... let's make sure we all know what they mean before we continue!

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Now by way of exploring certain concepts in optics, let us please consider some of the special effects in the finest motion picture in the history of American Cinema...

(I am, of course, speaking of Ridley Scott's 1982 tour de force <the sequel arrived a coupla years back, but I digress):

BLADE RUNNER

That film takes place at a far distant time in the future (2019 actually) when animal and human cloning is common.

Ridley Scott (he directed Blade Runner, Alien, The Martian and others!) recently described a particular scene in the movie as one of his favorite scenes ever and his favorite of the movie.

During that scene the cinematographer used certain techniques to make an owl's eye glow. Please note, that isn't an illusion, the owl's eye does actually glow red.

PLEASE DO NOT GOOGLE THIS UNLESS AND UNTIL I TELL YOU TO!

Later on in the film the director uses that same effect when showing a cloned human:

Keep in mind that BLADE RUNNER was filmed in the early 1980's so there actually were some digital effects available, but not nearly to the extent that are used today...

All that is by way of saying that effect was done using a real owl without digital enhancements)

PLEASE DO NOT GOOGLE THIS UNLESS AND UNTIL I TELL YOU TO!

The question for you to ponder today is: How did the director do that?

Please take a moment and make a sketch to show your thoughts on how you think this effect was achieved (use arrows to indicate light rays, also, consider including the words o' the day in your descriptions)

By the by, the technical term for this phenomenon is 'retroreflection'

Note: Understanding this phenomenon is actually one of our learning targets!

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Now we'll break into rather large groups of 8 - 10 students each.

One person will be PM, one person will report back what you've found.

PM's, it's your job to keep the conversation going. It is NOT your job to try and answer the question.

Through appropriate Socratic questioning, the PM should work to get the entire group involved to answer the query.

I'll drop in periodically!