## Light

What is Snell's law? | What is the equation for the critical angle? |

What is the thin lens equation? | What is lens power? |

What is the focal length of two lenses in contact? | What is the equation for the energy of a photon? |

What is Snell's law? | What is the equation for the critical angle? |

What is the thin lens equation? | What is lens power? |

What is the focal length of two lenses in contact? | What is the equation for the energy of a photon? |

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