Chapter 25 Part 1

Question 1

Dual Nature of Light

Answer 1

Light can be a wave or particle

Question 2

Reflection

Answer 2

Light encountering the second medium BOUNCES off that medium

Question 3

Refraction

Answer 3

Light passing INTO the second medium BENDS through an angle with respect to the normal to the boundary

Question 4

Specular Reflection (Smooth Surface)

Answer 4

in parallel, out parallel

Question 5

Diffuse Reflection (Rough Surface)

Answer 5

In different angle, out different angle

Question 6

Law of Reflection

Answer 6

0=0’
incidence angle=reflection angle

INCIDENCE RAY, NORMAL, AND REFLECTED RAY IN SAME PLANE

Question 7

Law of Refraction

Answer 7

INCIDENCE RAY, NORMAL, AND REFRACTED RAY SAME PLANE

REFRACTED RAY bends TO NORMAL due to V2 < V1

Question 8

Refraction of Light

Answer 8

HIGH density, LOW velocity, FARTHER from normal

LOW density, HIGH velocity, CLOSER to normal

Question 9

Index of Refraction (1 OR >1)

Answer 9

n=c/v

n=velocity of light in vacuum/velocity of light in medium

Question 10

Law of Refraction

Answer 10

Medium 1 -> Medium 2

VELOCITY CHANGES due to wavelength, FREQUENCY CONSTANT

Question 11

Snell’s Law of Refraction

Answer 11

n1sin(01)=n2sin(02)

Question 12

Dispersion

Answer 12

Color/wavelength have different n in same substance which creates a prism

Question 13

White Light (All Colors)

Answer 13

RED bends LESS ( HIGH WAVELENGTH)

BLUE bends MORE (LOW WAVELENGTH)

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Question 14

Total Internal Reflection

Answer 14

Used to change the direction of light

EX: Periscope, Fiber Optics

Question 15

Total Internal Reflection (ONLY n1>n2)

Answer 15

sin0c=n2 (OUT)/n1 (IN)