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level: Eyes and Refractrion

Questions and Answers List

level questions: Eyes and Refractrion

QuestionAnswer
What are the two types of lens?Concave and Convex
What happens when light passes through a lens?It always refracts and passes through a point called the focus.
What are the 7 parts of the eye called?Sclera, Retina, optic nerve, cornea, lens, pupil, iris
What is the nerve connected to the eye?Optic nerve
What is refraction?The phenomenon of light, radio waves ect passing through mediums of varying density, changing the speeds.
What is the speed of light through air?300,000 km/s
What happens when light enters a denser medium?Speed is decreased, causing refraction.
What happens to rays when it enters a double convex lens?They converge into a focus.
What happens when rays enter a double concave lens?The light rays are diverged and spread out.
What happens with long-sightedness?Light rays refracted by the lens focus behind of the retina
What happens with short-sightedness?The light rays refracted by the lens focus infront the retina
What is the cornea's purpose?Controls the entry of light into the eye, bending or refracting to focus light.
What is the purpose of the pupilControlling the amount of light entering the eye - light reflex
What is the purpose of the iris?Shrinks or widens the pupil to regulate light
Lens and retina relationship?The lens focuses rays to the retina to send through the optic nerve.
What does the retina do?absorb and convert light to electrochemical impulses.
What is the refractive index?A measurement of how dense a medium is.
When does light bend toward the normal?When entering a substance of higher density
When does light bend away from the normal?when entering a substance of lesser density