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2 cards from this section. Quick, good the night before a test.
Define reflection.
Think of how light shines off a mirror.
What is the critical angle?
It's important for total internal reflection!
What does Snell's Law describe?
It has 'sine' in its equation.
The critical angle is the angle of incidence for which the refraction is 90°.
Think about where total internal reflection occurs.
If a beam of light enters water at an angle of 30 degrees, calculate the angle of refraction if the refractive index of water is 1.33.
Use the sine function for calculations.
A concave lens forms an image 10 cm from the lens while the object is 30 cm away. What is the focal length of the lens?
Rearrange to find f.
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