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# ciannas optics

### optics test flashcards

what is the longest wavelength? radio waves
what is the shortest wavelength? gamma rays
primary colours? red, blue, green
secondary colours? red+green=yellow, green+blue=cyan, blue+red=magenta
complementary colours? red+cyan, green+magenta, blue+yellow
difference between transparent, translucent and opaque? transparent; allows wavelengths to pass through. translucent; allows some light to pass through. opaque; does not allow light to pass through
)( is ? and () is ? )( is concave/diverging and () is convex/converging.
in a converging lens, where is F? where is F in a diverging lens? F is on the opposite side of the object in a converging lens, and F is on the same side of the object in a diverging lens.
what is 0.000 012 3 in scientific notation? 1.23 x 10^ -5
what is the formula for index of refraction? n=c/v
in reflection, and of incidence =? angle of incidence = angle of refraction
if angle of incidence is 0, what is the angle of refraction? 0
why can we still see the sun when its setting? its rays refract through the atmosphere and bend towards the surface on the Earth.
why does a diamond sparkle? light entering a diamond will experience TIR multiple times before it exists the diamond
how can you determine the critical angle? set angle of refraction (theta r) to 90 degrees
if an image is formed on the opposite side of the object, what type of image is it? real image
if an image is formed on the same side as the object, what type of image is it? virtual image
for thin lens equations, when is f positive and when is it negative? f is positive for a converging lens, and f is negative for a diverging lens
what cells allow us to see at night? rod cells
what happens to black and white objects? black; absorbs all colours. white; reflects all colours
what rays can penetrate through human tissues? gamma rays
what causes a rainbow to form? dispersion within droplets of water
Created by: ciannawilliams

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