Light, Lenses and mirrors

Light, Lenses and Mirrors

Optics is the study of how light interacts with the eye. If you have a problem with your eyesight, you can go and see a special doctor, an optometrist.

​

What are lenses

A lens is a clear piece of glass or plastic that refracts light. Lenses have one more curved surfaces. Lenses are used to make objects appear larger or smaller. Lenses are commonly used eyeglasses, cameras, telescopes and other tools.

​Convex lenses bend light inwards. All light rays enter horizontally and are bend, meeting at focal point behind the lens. Rays farthest from the center are bend the most. People with hypermetropia need to wear glasses with this type of lens.

​​Convex Lens

Concave lenses bend light outwards. Light rays passing through the ends of the lens are bend the most, while rays passing through the middle aren’t bend at all. Rays do not meet behind the lens. People with myopia need this type of lens.

​​Concave Lens

Multiple Choice

When you have a problem with your eyesight you visit the specialist

• Radiologist

• Optometrist

• Allegologist

Multiple Choice

What type of lens is necessary to correct hypermetropia?

• Concave Lens

• Convex Lens

• Plane Lens

Multiple Choice

What type of lens is used to correct myopia?

• Concave Lens

• Convex Lens

• Plane Lens

What can you use to see if you are well groomed? Mirrors are objects that reflect light, maintaining most of its original characteristics. The common mirror is called is a plane mirror because it has a flat surface. Curved mirrors change the image and reflect light. Convex mirrors, for example, help to see objects bigger than they actually are. Mirrors are used by humans for personal use, decoration, in architecture and for scientific purposes. For example, they are used to research the universe with telescopes and cameras.

​

Mirror

Multiple Choice

What object is used to maintain most of the original characteristics of the reflected light?

¿Qué objeto se utiliza para mantener la mayoría de las características originales de la luz reflejada?

• Telescopes

• Cameras

• Mirrors

Multiple Choice

What is the most common type of mirror that we find in our homes?

¿Cuál es el tipo más común de espejo que encontramos en nuestras casas?

• Concave mirror

• Convex mirror

• Plane mirror

Multiple Choice

What type of mirror helps you see objects larger than they really are?

¿Qué tipo de espejo ayuda a ver objetos más grandes de lo que realmente son?

• Concave mirror

• Convex mirror

• plane mirror

Multiple Choice

This image corresponds to

• Concave Lens

• Convex Lens

• Plane Lens

Multiple Choice

• Concave lens

• Convex lens

• Plane lens

It is the throwing back of light (or other types of energy) by surface or object.

Reflection

It is the bending of light because of a change in medium.

Refraction

Multiple Choice

Reflection is the throwing back of light (or other types of energy) by surface or object.

• YES

• NO

Multiple Choice

Refraction is the bending of light because of a change in medium.

• YES

• NO