Flashing, Lights Lights Lights Lights

Question 1

First Law of REFLECTion

Answer 1

the incident ray (i), reflected ray(r), and the normal all lie in the same plane

Question 2

Second Law of REFLECTion

Answer 2

the incident ray (i) and the reflected ray (r) must be equal

Question 3

First Law of REFRACTion

Answer 3

the incident ray (i), refrated ray(r), and the normal all lie in the same plane

Question 4

Second Law of REFRACTion

Answer 4

sin i/sin r = constant

Question 5

Refractive index (n) Formula (There’s 2)

Answer 5

n=sin i / sin r OR n=c(speed in vacuum)/v(speed in medium)

Question 6

Critical Angle (C) Formula

Answer 6

sin C = 1/n

Question 7

2 conditions for Total Internal Reflection

Answer 7

Light MUST pass from an d͟e͟n͟s͟e͟r to a l͟e͟s͟s͟ d͟e͟n͟s͟e͟ medium / angle of incidence (i) > Critical Angle (C)

Question 8

Define Focal Length (F)

Answer 8

It is the distance along the principle axis between the optical center of the lens and the principle focus

Question 9

What happens when object is moved CLOSER to the LENS

Answer 9

• Image is formed closer to the lens
• Image becomes smaller
• Image formed becomes BRIGHTER