Chapter 4.4 Flashcards

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1
Q

Law of reflection

A

The angle of incidence is equal to the angle of reflection. The reflected and incident days and the normal to the surface lie on the same plane, called the plane of incidence

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2
Q

Refraction

A

The travel of light from one medium into another where it has a different speed

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3
Q

Snell’s law

A

n1sin(theta1) = n2sin(theta2)

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4
Q

Refractive index formula

A

nm = c/cm
c = speed of light in a vacuum
cm = the speed of light in the medium

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5
Q

Dispersion

A

Rays that are refracted by different angles due to differences in wavelength

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6
Q

Critical angle

A

The angle of incidence for which the angle of refraction is 90

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7
Q

Total internal reflection

A

When the angle of incidence is greater than the critical angle so there is only a reflected ray

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8
Q

Diffraction

A

The spreading of a wave as it goes past an obstacle or through an aperture

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9
Q

When does diffraction take place?

A

When a wave with a wavelength comparable to or larger than the size of an aperture or an obstacle moves through or past the aperture or obstacle

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10
Q

The larger the wavelength, the __ the effect of diffraction

A

Greater

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11
Q

Path difference

A

The distance of the point from the two sources

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12
Q

Constructive interference

A

When individual waves with the same wavelength, frequency and speed meet resulting in a wave with double the amplitude

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13
Q

Destructive interference

A

When individual waves with the same wavelength, frequency and speed meet and cancel each other out resulting in no amplitude

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14
Q

When does constructive interference occur?

A

When the path difference is n(wavelength) where n = 0, 1, 2, 3, …

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15
Q

When does destructive interference occur?

A

When the path difference is (n + 0.5)(wavelength) with n = 0, 1, 2, 3, …

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16
Q

Formula to find the distance on the screen between the middle of a bright spot and the middle of the next spot in double slit interference

A

s = (wavelength x D)/d

D = distance between the slits and the screen
d = distance between the slits