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Preknowledge

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Lens
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Work in progress, expect frequent changes. Help and feedback is welcome. See discussion page.


Contents

Preknowledge

Preknowledge

Essential


Optional




Multichoice Question

Multichoice Question

 
What is answer best describes the phrase "Click and Drag"?

Add a Hint


(a) A mouse trap snaps closed. The mouse walks away dragging the cheese.

Incorrect, think about computer mice.


(b) Navigate the cursor over the object you wish to move. Click and hold the (left) mouse button. Drag to object to the desired location. Release the mouse button.

Absolutely correct!



Reflection

Reflection

For our purposes it is a computer related term.

Thus choice (b) is the best answer.

 


If you are uncomfortable with the concept of rays, you should try this question.


Multichoice Question

Multichoice Question

 
Which one of the three diagrams below best represents a light ray?

Light travels in a straight line unless it encounters a change in refractive index.


(a)

Incorrect, think about how light travels.


(b)

Incorrect, think about how light travels.


(c)

Absolutely correct!



If you are uncomfortable with the concept of lenses, you should try this question before moving on.


Multichoice Question

Multichoice Question

 
Which diagram below best represents a converging lens?

A converging lens is convex in shape.


(a)

Incorrect, think about the shape of the lens.


(b)

Absolutely Correct!



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