CBSE 2025 · Region 4 · Set 1 · Q26 · 3 marks
A double slit set-up was initially placed in a tank filled with water and the interference pattern was obtained using a laser light. When water is replaced by a transparent liquid of refractive index $\displaystyle \mathrm{n}>\mathrm{n}_{\text {water }}$,what will be the effect on the following?(a)Speed, frequency and wavelength of the light of laser beam.(b)The fringe width, shape of interference fringes and shift in the position of central maximum.
A double slit set-up was initially placed in a tank filled with water and the interference pattern was obtained using a laser light. When water is replaced by a transparent liquid of refractive index $\displaystyle \mathrm{n}>\mathrm{n}_{\text {water }}$,what will be the effect on the following?
(a)
Speed, frequency and wavelength of the light of laser beam.
(b)
The fringe width, shape of interference fringes and shift in the position of central maximum.
Marking-scheme solution
(a)
Speed of light will decrease.
Frequency remains unaffected.
Wavelength decreases.
(b)
Fringe width decreases.
Shape does not change.
Position of central maximum does not change.
Wave OpticsInterference of Light Waves and Young’s ExperimentUnderstandshort_answermedium
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.