| 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 pupil | Controlling 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 |
