A line that is perpendicular to the surface where light is entering from one medium to another

(a)  

A dark area or shape produced by a body coming between rays of light and a surface

(a)  

Anything that spins or rotates has to turn around a central line

(a)  

A model of the Earth

(a)  

At an angle, not vertical

(a)  

An object that allows light completely passes through it, and you can see clearly through it

(a)  

The constant rotation of an object

(a)  

The sun and the planets, moons, comets and asteroids which move around it. ‘Solar’ means sun

(a)  

A rocky mass that orbits the sun. These are similar to planets but much smaller

(a)  

To make smaller or lesser

(a)  

A diagram to show how light travels

(a)  

Hollowed out or rounded inward

(a)  

A lump of ice and dirt which moves in a large orbit around the sun

(a)  

The space between two lines that meet at a surface, measured in degrees

(a)  

The point where rays of light converge

(a)  

A material such as air, water or glass

(a)  

A bulging shape, curved or rounded outward

(a)  

A device that uses mirrors for you to see things that are otherwise out of sight

(a)  

A flat mirror, rather than a mirror with a curved surface, such as a concave or convex mirror

(a)  

When light traveling through one material bounces off a different material

(a)  

The increasing in size of the lit-up part of the Moon in its monthly cycle

(a)  

The curved sickle shape or a curved shape that has two narrow pointed ends, like the moon when it is less than half of a circle

(a)  

To move apart or be separate or to extend in different directions from a common point

(a)  

In an erect position or posture; perpendicular; vertical, or pointing upward

(a)  

The bending of light

(a)  

The decreasing in size of the lit-up part of the Moon in its monthly cycle

(a)  

The ray of light that arrives at the mirror

(a)  

The bright part greater than a semicircle and less than a circle.

(a)  

Turn it upside down

(a)  

Reflection in a mirror

(a)  

Something our eyes see, but it is not real

(a)  

A transparent material such as glass

(a)  

The changing shapes of the Moon in its monthly cycle

(a)  

The path an object follows as it moves around another one

(a)  

An object that does not allow light to pass through

(a)  

To meet or come together

(a)