Physics mirrors lenses and electromagnetic spectrum test

What is a lens?

A lens is a carefully shaped piece of transparent material that refracts light rays in such a way as to form an image

What is a converging lens?

A lens that converges rays of light that are travelling parallel

What are converging lenses like?

they are relatively thick

What is a focal point?

the point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed

What is a diverging lens?

a lens that diverges rays of light that are traveling parallel to its principal axis.

What do diverging lenses look like?

They are relatively thin across their middle and thick at their upper and lower edges.

What is the main difference between a lens and a mirror

The main difference between a lens and a mirror is that light

rays are refracted through a lens while mirrors reflect or

bounce back light rays.

What are the uses of lenses?

Lenses are used in imaging tools like cameras, binoculars, and

telescopes. They are also extensively used for correcting

vision defects such as hypermetropia and myopia.

How are electromagnetic waves formed?

when an electric field

comes in contact with a magnetic field.

What are the types of EM radiation that make up the electromagnetic radiation spectrum from lowest frequency to highest frequency or longest to shortest wavelength?

Radio waves, Microwaves, Infrared Radiation, Visible light, Ultraviolet Radiation, X-Rays, and Gamma Rays.

What are the uses of radio waves?

radio and television

What are the uses of microwaves?

satellite communications and cooking food

What are the uses of infrared?

Electrical heaters, cooking food and infrared cameras

What are the uses of visible light?

Fibre optic communications

What are the uses of Ultraviolet radiation?

Energy efficient lamps and sun tanning

What are the uses of X-rays?

Medical imaging and treatments

What are the uses of gamma rays?

Medical imaging and treatments

How do you draw a convex lens (converging) ray lens diagram?

Draw a horizontal principal axis, sketch the convex lens (double arrow shape), mark the focal points (F) on both sides, draw an object upright left of lens, draw rays: one parallel then through F, one through center, and mark the real, inverted image where rays converge.

How do you draw a concave lens (diverging) ray lens diagram?

Draw a principal axis and concave lens (hourglass shape).

mark focal points (F) on both sides, draw object left of lens. Ray 1: parallel, diverges as if from F. Ray 2: toward center, continues straight, extend rays backward; mark virtual, upright image.