Skip to main content Go home Shop Language English Deutsch Search All about physics Courses Lessons Videos Arguments Questions Exercises Formulary Illustrations Log into an avatar Email or Avatar-ID Password Unlock upgrades✅ Unlock all physics videos✅ Unlock all exercise solutions✅ Unlock "Rearrange equations"✅ Unlock all downloads✅ Hide adsDo you want to unlock all content and features?Yes, I want! Breadcrumb Go home Optics Optics: Questions and AnswersDo you have a optics question that starts with What, How, Where or Why? Here you will find 5 questions and short but precise answers from optics.Questions of a specific discipline QuestionsPhysics QuestionsMechanics QuestionsThermodynamics QuestionsElectrodynamics QuestionsOptics QuestionsQuantum Mechanics QuestionsSolid State Physics QuestionsMathematics Max. Level - Any -Level 1 (suitable for all)Level 2 (without higher mathematics)Level 3 (with higher mathematics)Level 4 (for physics pros) Question How to Determine the Temperature of the Sun without Touching it? Question What is the Speed of Light? Question What is Wavelength? Question What is the Refractive Index? Question How do You Determine the Focal Length of a Lens?