A beam of light of wavelength 720 nm in air enters in water (refractive index = 4/3 ). Its wavelength in water will be?
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The image contains a set of multiple-choice physics questions. These questions cover topics like optics (wavelength change due to refractive index), AC circuits (reactance and capacitance), electrostatics (work done in bringing a charge), capacitors (effect of metal sheet insertion), and basic circuit analysis (equivalent resistance). We need to extract each question, classify it accordingly, and provide cleaned versions of the questions.
Answer
540 nm
The wavelength of the light in water will be 540 nm. The correct answer is (A).
Answer for screen readers
The wavelength of the light in water will be 540 nm. The correct answer is (A).
More Information
The wavelength of light changes when it enters a medium with a different refractive index. The wavelength in the new medium is equal to the wavelength in vacuum divided by the refractive index of the new medium.
Tips
Make sure to divide by the refractive index, not multiply.
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