# Reflection and Refraction Flashcards

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1
Q

Snell’s Law

A

sin(i)/sin(r) = refractive index (n)

2
Q

Refractive index and the speed of light

A

Speed of light in a vacuum / Speed of light in the medium = refractive index (n)

3
Q

Refractive index of air

A

1

4
Q

Light from one medium to another

A

n1sin(angle)1 = n2sin(angle)2

5
Q

Critical Angle definition

A

The largest angle refraction out of a denser medium is possible

6
Q

Critical Angle equation

A

n, medium = 1/sinx(the speed of light)

7
Q

Total Iternal reflection

A

All light is reflected back into the medium

8
Q

Convex Lens

A

(the fatter lens) converge/ focus light

9
Q

Principle Focus

A

Where converging rays meet

10
Q

Focal length defintion

A

The distance from the middle of the lens to the principle focus

11
Q

Principle Axis

A

The line passing through the centre of the lense, perpendicular to the lens

12
Q

Lens Power

A

1/f

13
Q

Concave Lens

A

(the thin lens) diverges/ spreads light

14
Q

Virtual principle focus

A

The point inwhich rays in a concave lens diverge as if they were coming from one point

15
Q

Images formed by a converging lens

A

inverted, real, smaller

16
Q

Images formed by a diverging lens

A

upright, virtual, smaller

17
Q

Lens Equation

A

1/ object distance (u) + 1/ image distance (v) = 1/ focal length

18
Q

Power of lens unit

A

D, if minus, is virtual

19
Q

Magnification equation

A

image size/ object size = image distance (v) / object distance (u)