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Lenses 10 Points 10 Points 10 Points 10 Points 10 Points 20 Points Reflection & Mirrors Definitions Refraction Lenses Angles & Optical Phenomena 10 Points 10 Points 10 Points 10 Points 10 Points 20 Points 20 Points 20 Points 20 Points 20 Points 30 Points 30 Points 30 Points 30 Points 30 Points 40 Points 40 Points 40 Points 40 Points 40 Points 50 Points 50 Points 50 Points 50 Points 50 Points

In reflection: Angle of incidence =

What is the angle of reflection

A mirror shaped like part of a sphere in which the inner surface is reflective

What is a concave mirror

Line through the centre of the centre of curvature to the midpoint of the mirror

What is the principal axis

A mirror shaped like part of a sphere in which the outer surface is reflective

What is a covex mirror

Point where the principal axis meets the mirror

What is the vertex

The ray that bounces off a reflective surface

What is a reflected ray

The angle between the incident ray and the normal

What is the angle of incidence

The perpendicular line to the mirror surface

What is the normal

Define apparent depth

The depth that an object appears to be due to the refraction of light in a transparent medium

Define mirage

What is a virtual image that forms as a result of refraction and total internal reflection in Earth’s atmosphere

The substance or material that light is travelling through (e. g The substance or material that light is travelling through (e.g. water, air, glass, oil)

What is a medium

Define Refraction

What is the change in direction of light as it moves from one medium to another “bending of light”

Why does refraction happens?

What is speed of light changes

2 conditions for refraction to occur

1- light must change media (change speed when crossing the boundary) What is 1- light must change media (change speed when crossing the boundary) 2- light must approach the boundary at an angle

The ratio of the speed of light in a vacuum (c) to the speed of light in a given material (v).

What is the index of refraction

Lens that is thickest in the middle (light rays bend through a single point)

What is a converging lens

Lens that is thinnest in the middle (light rays spread apart)

What is a diverging lens

Point at the exact centre of a the lens

What is an optical centre

The point at the principal axis of a lens where light rays parallel to the principal axis converge after refraction

What is the principal focus

Which lens ALWAYS produces a smaller, upright, virtual image?

What is a diverging lens

Angle of incidence that results in angle of refraction of 90˚

What is a critical angle

The situation when the angle of incidence is greater than the critical angle

What is total internal reflection

Technology that uses light to transmit information along a glass cable

What is Fibre optics

Optical phenomenon that is produced by water droplets in Earth’s atmosphere

What is a rainbow

3 changes in direction of light when it interacts with a raindrop to form a rainbow

What is 1- refraction (air to water), 2- partial internal reflection, 3- refraction (water to air)