08 Electromagnetic Radiation Flashcards
What are the different types of radiation?
-radio waves
-microwaves
-infrared radiation
-visible light
-ultra violet
-x-rays
-gamma rays
What does visible light form part of?
The electromagnetic spectrum.
What is the only part of the electromagnetic spectrum that our eyes can detect?
Visible light
What are the similarities between the different parts of the electromagnetic spectrum?
-all travel at the speed of light in a vacuum
-all transverse waves
-all massless
-all can propagate through a vacuum
What is the law of reflection?
Angle of incidence = angle of reflection
What are the angles of incidence and reflection measured between?
The ray and the normal
When light travels from air into glass, where is the light refracted?
Towards the normal
When light travels from glass into the air, where is the light refracted?
Away from the normal
What happens if the light incident is perpendicular to a glass block?
It continues in a straight line without refracting.
What is refraction?
Light incident upon a glass block at an angle changes direction.
What happens when a light incident upon a glass block at an angle.
It changes direction (refraction).
How does light leave a rectangular glass block?
Parallel to the ray entering.
How do you find the refractive index of a substance?
(Speed of light in a vacuum) / (speed of light in the substance)
What is the speed of light?
3x10⁸m s‐¹
What is the unit for refractive index?
Nothing