| What does a Len Effectively do? | -Simply just Refracts Light - Changing the Direction |
| What does a Concave Lens do? What happens in it? | -This is Lens that Caves Inwards
-It makes Parallel Light Rays Diverge [Spread Out] |
| What does a Convex Lens do? | -This is lens that Bulges Outwards
-It makes Parallel Light Rays Focus to a Spot |
| What is the Axis and Principle Focus? | -The Axis is a Line that Passes through the Middle of the Lens
-This line will always stay Straight, Convex or Concave
-The Principle Focus is a Spot where either the Rays that are Parallel appear to Come From, Simply just Trace it Back to a Spot [Concave] or when the Rays hitting the Lens Converge, hitting a Specific Spot |
| What are the 2 Type of Images that can Form and How can this Happen? | -A Real Image is when Light from the Object come Together to make an Image
-A Virtual Image when the Rays are Diverging, so making the Object look like its in a Different Place |
| How can you make a Ray Diagram for an Image, with a Concave Lens? | -First, Pick a Point from from the Top of the Object, and draw a Ray that is going to the Lens from the Point, that is Parallel to the Axis
-Then, draw another Ray from the Top of the Object that cuts through the Middle of the Lens
-The First Ray [Parallel] is Refracted, so it looks to come from the Principal Focus, so then draw a 'Ray' from the PF to the Refracted Parallel Ray [Make it Dotted as because its Virtual]
-When the 'Ray' and also the Ray that came from the Top of the Object that cuts through the Middle meet, you have found the Top of the Image |
| What type of Image is made by a Concave Lens? | -It always a Virtual Image, that is the Right way up and Small than the Object. It is also on the Same Side of the Lens as the Object |
| How can you make a Ray Diagram for an Image, with a Convex Lens? | -First, Draw a Ray from the Top of the Object to the Lens, that is Parallel to the Axis
-Then make another Ray that Cuts through the Middle of the Lens
-The Incident Ray that is Parallel is Refracted through the Principle Focus, so draw the Refracted Ray through F [Focal Length :)]
-The Ray that goes through the Middle does NOT Bend
-When the Rays meet, you have found the Top of the Object.
-IF they Rays DO NOT meet, then Trace the Refracted Rays the Same Direction through the Lens, and then they will meet making a Big Image |
| In a Convex Lens, what affects the Image Visually? What are the Outcomes if that Variable is changed? | -Simply the Distance from the Lens to the Object
-An Object that is 2 Focal Lengths will make an Upside Down but Real Image
-An Object that is between 1 and 2 Focal Lengths will make an Upside Down and Bigger Virtual Image
-An Object that is Less than 1 Focal Length will make the Right Way up Virtual Image that is also on the Same Side as the Object. |
| What's the Problem with Short Sighted People, and what can Correct it? | -The Eye naturally has a Convex Lens to Focus the Light onto the Back of the Eye to make an Image
-If the Eyeball is too Long, or the Lens is too Powerful, then Distant Objects will be Focused in Front of the Retina, making it Blurry
-Correcting it requires a Concave Lens, as it can Diverge the Light before it Enters the Eyes which then it can Focus on the Retina |
| What's the Problem with Long Sighted People, and what can Correct it? | -The Eye, if too Long or if the Lens is too Weak can lead to Long Slightness
-This makes Near Objects hard to Focus, as its brought into to Focus too Late, making it Blurry
-Correcting it needs a Convex Lens, so meaning it can it can Converge before it hits the Eye, allowing it to Focus on the Retina |
