Reflection and Refraction

Question 1

Snell’s Law

Answer 1

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

Question 2

Refractive index and the speed of light

Answer 2

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

Question 3

Refractive index of air

Answer 3

1

Question 4

Light from one medium to another

Answer 4

n1sin(angle)1 = n2sin(angle)2

Question 5

Critical Angle definition

Answer 5

The largest angle refraction out of a denser medium is possible

Question 6

Critical Angle equation

Answer 6

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

Question 7

Total Iternal reflection

Answer 7

All light is reflected back into the medium

Question 8

Convex Lens

Answer 8

(the fatter lens) converge/ focus light

Question 9

Principle Focus

Answer 9

Where converging rays meet

Question 10

Focal length defintion

Answer 10

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

Question 11

Principle Axis

Answer 11

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

Question 12

Lens Power

Answer 12

1/f

Question 13

Concave Lens

Answer 13

(the thin lens) diverges/ spreads light

Question 14

Virtual principle focus

Answer 14

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

Question 15

Images formed by a converging lens

Answer 15

inverted, real, smaller

Question 16

Images formed by a diverging lens

Answer 16

upright, virtual, smaller

Question 17

Lens Equation

Answer 17

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

Question 18

Power of lens unit

Answer 18

D, if minus, is virtual

Question 19

Magnification equation

Answer 19

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