Physics · Wave Optics
When light is incident on a thin transparent film in air, the light waves reflected from the front and back surfaces interfere. For near-normal incidence, what is the wavelength condition for maximum intensity (constructive interference) of the reflected light?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 12L = m(λ/n2), where m is an integer, n2 is refractive index, L is thickness and λ is wavelength in air.
- 22L = (m + 1/2)(λ/n2), where m is an integer, n2 is refractive index, L is thickness and λ is wavelength in air.✓
- 32L = mλ, where m is an integer, L is thickness and λ is wavelength in air.
- 4L = mλ/2, where m is an integer, L is thickness and λ is wavelength in air.
Correct answer
2L = (m + 1/2)(λ/n2), where m is an integer, n2 is refractive index, L is thickness and λ is wavelength in air.
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