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Wave Optics

MHT-CET Physics. Try each one first, then open its answer.

Top 10 MHT-CET PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    This type asked 17 times: 5 in 2023, 4 in 2024, 2 in 2025, 6 in 2026. This one: 15 May 2026 S2 See all 17 of this type

    142
    At two points PP and QQ on the screen in Young's double slit experiment, waves from slits S1S_1 and S2S_2 have a path difference of zero and λ4\dfrac{\lambda}{4} respectively. The ratio of intensities at PP and QQ will be (cos⁡0∘=1, cos⁡45∘=12)\left(\cos 0^\circ = 1,\ \cos 45^\circ = \dfrac{1}{\sqrt{2}}\right)

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  2. Question 2

    This type asked 12 times: 15 May 2023 S2, 12 May 2024 S2, 14 May 2024 S2, 20 Apr 2025 S1, 22 Apr 2025 S2, 13 Apr 2026 S2, 18 Apr 2026 S1, 18 Apr 2026 S2, 13 May 2026 S1, 13 May 2026 S2, 14 May 2026 S1, 15 May 2026 S1. This one: 15 May 2026 S1 See all 12 of this type

    141
    In Young's experiment, one of the slit is covered with a transparent sheet of thickness 3.6×10−33.6 \times 10^{-3} cm due to which position of central image shifts to a position originally occupied by 30th30^{th} bright fringe. The refractive index of the sheet is (λ=6000 A˚)(\lambda = 6000\ \mathrm{\mathring{A}})

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  3. Question 3

    This type asked 11 times: 3 May 2023 S2, 9 May 2023 S1, 11 May 2023 S1, 11 May 2024 S2, 13 May 2024 S2, 14 May 2024 S2, 19 Apr 2025 S2, 22 Apr 2025 S2, 25 Apr 2025 S1, 19 Apr 2026 S1, 20 Apr 2026 S1. This one: 20 Apr 2026 S1 See all 11 of this type

    141
    Light of wavelength 580580 nm is incident normally on a slit of width 'aa'. The distance between slit and screen is 2.52.5 m and the distance of the second order maximum from the centre of the screen is 14.514.5 mm in a diffraction pattern. The value of 'aa' is

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  4. Question 4

    This type asked 10 times: 16 May 2023 S2, 10 May 2024 S1, 12 May 2024 S1, 20 Apr 2025 S2, 25 Apr 2025 S2, 19 Apr 2026 S2, 12 May 2026 S1, 15 May 2026 S1, 19 May 2026 S1, 19 May 2026 S2. This one: 19 May 2026 S2 See all 10 of this type

    143
    In Young's double slit experiment, the separation between the slits is decreased to (13)th\left(\dfrac{1}{3}\right)^{th} of its original distance and the distance between the slits and the screen is doubled. The fringe width

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  5. Question 5

    This type asked 9 times: 4 May 2023 S1, 19 Apr 2025 S1, 21 Apr 2025 S1, 22 Apr 2025 S2, 11 Apr 2026 S1, 16 Apr 2026 S2, 17 Apr 2026 S2, 12 May 2026 S1, 15 May 2026 S2. This one: 15 May 2026 S2 See all 9 of this type

    143
    Three polaroid sheets are co-axially placed such that pass axis of polaroids 22 and 33 make 30∘30^\circ and 90∘90^\circ with pass axis of sheet. If I0I_0 is the intensity of unpolarised light entering first sheet, the intensity of the emergent light through 3rd3^{rd} sheet is

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  6. Question 6

    Asked 8 times: 3 May 2023 S2, 9 May 2023 S2, 15 May 2023 S2*, 9 May 2024 S2*, 19 Apr 2025 S2*, 19 Apr 2026 S1, 19 Apr 2026 S2*, 13 May 2026 S1 (* = numbers or wording changed that year) See all 8 times it was asked

    143
    The wavelength of light used in Young's double slit experiment, is λ\lambda. The intensity at a point on the screen is I, where the path difference is λ6\dfrac{\lambda}{6}. If I0I_0 is the maximum intensity then the ratio I to I0I_0 is (cos⁡30∘=32)\left(\cos 30^\circ = \dfrac{\sqrt{3}}{2}\right)

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  7. Question 7

    This type asked 8 times: 3 May 2023 S2, 10 May 2023 S2, 10 May 2024 S2, 19 Apr 2025 S2, 21 Apr 2025 S1, 26 Apr 2025 S2, 11 Apr 2026 S2, 16 Apr 2026 S2. This one: 16 Apr 2026 S2 See all 8 of this type

    143
    In Young's double slit experiment, two slits are illuminated with a light of wavelength λ\lambda. The line joining A1PA_1P is perpendicular to A1A2A_1A_2 as shown in figure. If the first minimum is detected at P, the value of slits separation 'a' will be (D = distance between source and screen)

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  8. Question 8

    This type asked 7 times: 9 May 2023 S2, 10 May 2023 S2, 15 May 2023 S1, 9 May 2024 S2, 26 Apr 2025 S1, 16 Apr 2026 S1, 14 May 2026 S1. This one: 14 May 2026 S1 See all 7 of this type

    143
    If fringe width is 0.40.4 mm, the distance between fifth bright and third dark band on the same side in interference pattern of Young's double slit experiment is (in mm)

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  9. Question 9

    This type asked 7 times: May 2022 S1, 9 May 2024 S1, 10 May 2024 S2, 11 May 2024 S1, 14 May 2024 S1, 15 Apr 2026 S1, 20 Apr 2026 S2. This one: 20 Apr 2026 S2 See all 7 of this type

    142
    In diffraction experiment from single slit, the angular width of the central maxima does NOT depend upon

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  10. Question 10

    This type asked 7 times: 10 May 2023 S1, 11 May 2024 S2, 14 May 2024 S1, 22 Apr 2025 S1, 26 Apr 2025 S1, 16 Apr 2026 S1, 20 Apr 2026 S1. This one: 20 Apr 2026 S1 See all 7 of this type

    143
    In a biprism experiment, the distance between 4th4^{th} and 13th13^{th} bright band on the same side is 'yy' when light of wavelength 6000 A˚6000\ \mathrm{\mathring{A}} is used. For a light of wavelength 'λ\lambda' the distance between 6th6^{th} and 16th16^{th} bright band on the same side is again 'yy'. The value of 'λ\lambda' in A˚\mathrm{\mathring{A}} units is

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