Science: Mirrors, Lenses, Seeing and Using Light

Flashcards

What are two types of reflection?

Regular and diffuse

What are 3 types of mirrors?

Plane, Convex, and Concave

Which type of mirror always produce an image that is upright and reduced?

Concave

What causes a light ray to refract/bend?

A change in medium and speed

What are two types of lenses and how can you tell them apart?

Convex and Concave. Convex is curving outward and is thicker in the middle, Concave is curving inward and is thinner in the middle.

Which type of lens always produces an image that is upright and reduced?

Concave

What happens to light rays when they pass through a concave lens?

They scatter and spread

What happens to light rays when they pass through a convex lens?

they focus to the focal point

Define index of refraction

measure of how much a light ray bends when going from one medium into another.

What is a mirage

picture of a far away object made when light refraction happens in changing temperatures

Be able to identify parts of the eye with their description.

Cornea- transparent surface/lens on eye

Optic nerve- Carry signal from eye to brain

Retina- Layer of cells lining inside of eyeball

Lens- Behind pupils

Pupil- opening where light goes in eye

Iris- ring of muscle that changes the size of pupil

What does it mean to be farsighted?

seeing far things clearer and close things more blurry

what does it mean to be nearsighted?

Seeing close things clearer but far things more blurry

What kinds of objects do microscopes allow us to see better?

tiny objects

What instruments allow us to see distant objects?

Telescopes

Review diagrams in textbook

1: they meet at focal point and one of the images in flipped and smaller

2: convex focuses the light and concave spreads it