Total internal reflection: Critical angle; examples in triangular glass prisms; comparison with reflection from a plane mirror (qualitative only). Applications of total internal re... Total internal reflection: Critical angle; examples in triangular glass prisms; comparison with reflection from a plane mirror (qualitative only). Applications of total internal reflection. (iii) Lenses (converging and diverging) including characteristics of the images formed (using ray diagrams only); magnifying glass; location of images using ray diagrams and thereby determining magnification. (iv) Using a triangular prism to produce a visible spectrum from white light; Electromagnetic spectrum. Scattering of light.
Understand the Problem
The question is addressing multiple concepts related to optics, specifically focusing on total internal reflection, lenses, and the behavior of light through a prism to produce a spectrum. It involves qualitative comparisons, ray diagrams for lenses, and the scattering of light.
Answer
Total internal reflection: Light transitioning from denser to less dense medium, with an incident angle > critical angle, used in triangular prisms for 100% reflection.
Total internal reflection occurs when light travels from a denser to a less dense medium with an angle of incidence greater than the critical angle. This phenomenon is utilized effectively in triangular prisms to achieve 100% reflection, unlike plane mirrors.
Answer for screen readers
Total internal reflection occurs when light travels from a denser to a less dense medium with an angle of incidence greater than the critical angle. This phenomenon is utilized effectively in triangular prisms to achieve 100% reflection, unlike plane mirrors.
More Information
Total internal reflection has several applications such as in optical fibers, diamonds for their sparkle, and in devices like periscopes and binoculars.
Tips
A common mistake is to think total internal reflection can occur in any direction; it only occurs when moving from a denser to a less dense medium and the incidence exceeds the critical angle.
Sources
- The Critical Angle - Physics Tutorial - physicsclassroom.com
- Total internal reflection - Wikipedia - en.wikipedia.org
- Totally reflecting prisms - Critical angle and total internal ... - BBC - bbc.co.uk
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