Class 12 Physics simulations · Electromagnetic Waves

Light entering a medium (3D fields)

Watch E and B oscillate at right angles as light travels into glass. Rotate the polarisation plane.

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What to notice

Frequency stays the same in the medium; speed and wavelength both drop by a factor n.

Key relation

v = c/n, λ = λ₀/n, B₀ = nE₀/c

Try this

Increase n. Watch the wave crests bunch up inside the medium.

What you can change

• Refractive index n: 1 to 2.5
• Vacuum wavelength: 400 to 700 nm
• Polarisation angle: 0 to 90 °
• Field amplitude E₀: 10 to 1000 V/m

More in Electromagnetic Waves

• Radiation from a dipole antenna
• Displacement current between plates
• Electromagnetic wave
• Photon energy across the spectrum
• Explore the EM spectrum

See all Class 12 Physics simulations or every Physica simulation.