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How do ultrasound machines get picture of developing babies in the womb?

How do ultrasound waves help with the removal of kidney stones?

Compare how safe ultrasound, xrays and ct scans are..

Compare the image quality of ultrasound, xrays and ct scans...

Define: Refraction

What does the change in density in refraction do to the wave?

What is the normal line?

What is the angle of incidence?

What is the angle of refraction?

Define: Lens