PHYSICAClass 12 Physics simulations · Ray Optics and Optical Instruments
Guiding light in an optical fibre
Launch a ray inside a glass core and check whether the surrounding layer keeps it trapped.
What to notice
Total internal reflection needs a higher-index core and incidence above the critical angle at each wall.
Key relation
θcritical = sin⁻¹(ncladding / ncore)
Try this
Increase the internal launch angle until the ray leaks out.
What you can change
- Core refractive index: 1.45 to 1.65
- Cladding refractive index: 1.3 to 1.44
- Ray angle to fibre axis: 5 to 45 °
More in Ray Optics and Optical Instruments
- Real and apparent depth
- Astronomical telescope
- Compound microscope
- Image in a concave mirror
- Two thin lenses in contact
- Image through a convex lens
- Lens maker’s formula
- Images in two inclined mirrors
- Prism: angle of minimum deviation
- Dispersion through a prism
- Refraction and total internal reflection
- Spherical mirrors: ray diagram
- Total internal reflection
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