Lenses
What is a concave lens?
This type of lens is thinner in the middle than at the edges and spreads light rays apart.
What is the principal axis?
This line passes straight through the center of a lens and is not bent by refraction.
What is a convex lens?
This type of lens is thicker in the middle and brings parallel light rays together at a focal point
What is the focal length?
The distance from the optical center of a lens to the focal point is called this.
What is the focal point?
The point where light rays converge after passing through a convex lens is called this.
What is magnified (larger than the object)?
When an object is placed inside the focal length of a convex lens, the image formed is upright and has this property.
What is a virtual image?
This kind of image is formed by concave lenses and is always upright and smaller than the object.
What is a microscope?
This device uses two convex lenses to magnify tiny objects, commonly used in science labs.
What is a real image?
When a convex lens forms an inverted image on a screen, that image is described as this type
What is refraction?
The bending of light as it passes from one medium to another, which allows lenses to work, is called this.