Refractive index, is the ratio of speed of light in vacuum to the speed of light in the medium, Critical angle, is the angle of incidence in the optically denser medium when the angle of refraction in the less dense medium is 90°, Focal point, is the point on the principal axis of the lens whereby all light rays parallel to the principal axis converge to after passing through the lens, Focal Length, is the distance between the principal focus and the optical centre of the lens, Reflection, The rebounding of light at a surface, Incident ray, the light ray that hits the reflecting surface, Normal, is the perpendicular to the reflecting surface at the point of incidence, Reflected ray, the light ray that bounces off the reflecting surface, Angle of incidence, the angle between the incident ray and the normal, Angle of reflection, the angle between the reflected ray and the normal, Refraction, is the change in direction when a light ray passes from one medium to another at a glancing angle, Total internal reflection, is the complete reflection of a light ray inside an optically denser medium at its boundary with an optically less dense medium, Real Image, is an image that can be captured on a screen, Virtual Image, is an image that cannot be captured on a screen

Physics Definition Chapter 10

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