Khan Academy on a Stick
Waves and optics

Introduction to Waves
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Introduction to transverse and longitudinal waves

Amplitude, Period, Frequency and Wavelength of Periodic Waves
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Amplitude, period, frequency and wavelength of periodic waves

Introduction to the Doppler Effect
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Introduction to the Doppler Effect

Doppler effect formula when source is moving away
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Doppler effect formula when source is moving away

When the source and the wave move at the same velocity
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When the source and the wave move at the same velocity

Mach Numbers
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Mach numbers

Specular and Diffuse Reflection
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Specular and Diffuse Reflection

Specular and Diffuse Reflection 2
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Specular and Diffuse Reflection 2

Refraction and Snell's Law
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Refraction and Snell's Law

Refraction in Water
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Refraction in Water

Snell's Law Example 1
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Snell's Law Example 1

Snell's Law Example 2
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Snell's Law Example 2

Total Internal Reflection
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Critical incident angle and total internal reflection

Virtual Image
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Virtual Image

Parabolic Mirrors and Real Images
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Parabolic Mirrors and Real Images

Parabolic Mirrors 2
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Parabolic Mirrors 2

Convex Parabolic Mirrors
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Convex Parabolic Mirrors

Convex Lenses
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Convex Lenses

Convex Lens Examples
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Convex Lens Examples

Doppler effect formula for observed frequency
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Doppler effect formula for observed frequency

Concave Lenses
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Concave Lenses

Object Image and Focal Distance Relationship (Proof of Formula)
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Object Image and Focal Distance Relationship (Proof of Formula)

Object Image Height and Distance Relationship
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Object Image Height and Distance Relationship