75 past-paper questions on Wave Optics from ISC Class 12 Physics papers (2027-2018), newest first, in full. Questions 21-40 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.
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Answer the following.
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Study the Assertion and Reason and choose the correct option.
Assertion: Phase difference between two overlapping waves to produce a bright band is $2\pi, 4\pi, 6\pi, 8\pi, \dots, 2n\pi$.
Reason: When crest of one wave falls on crest of another wave, amplitude of the resulting wave decreases.
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Draw the following.
Draw: optical device and transmitted wavefront
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Solve the following.
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Study the Assertion and Reason and choose the correct option.
Assertion: Diffraction of light is difficult to observe in everyday situations but can be observed in laboratory conditions.
Reason: To produce diffraction of waves, size of an obstacle must be comparable to the wavelength of the waves.
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Draw the following.
Draw: ray diagram showing incident and refracted wavefronts with angle of incidence i and angle of refraction r
Must show: incident wavefront, refracted wavefront, angle of incidence i, angle of refraction r
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Derive the following.
Given: Plane wavefront incident obliquely on a plane reflecting mirror surface
To show: Angle of reflection is equal to angle of incidence ($i = r$)
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Draw the following.
Draw: labelled graph showing the variation in intensity of diffracted light with diffracting angle in a single slit Fraunhofer diffraction experiment
Must show: central maximum, secondary maxima and minima, intensity on y-axis and diffracting angle on x-axis
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