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Wave Optics 3 Mark Creative Question Paper With Answer Key

12th Standard

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Physics

Time : 00:45:00 Hrs
Total Marks : 30

     3 Marks

    10 x 3 = 30
  1. What are the conditions for obtaining clear and broad interference bands?

  2. Discuss diffraction at single slit and obtain the condition for nth maximum.

  3. What are Airy's discs?

  4. Write the drawbacks of Nicol prism.

  5. What is the difference between resolution and magnification?

  6. Light of wavelength of 5000 Å produces diffraction pattern of the single slit of width 2.5 μm. What is the maximum order of diffraction possible?

  7. I0 is the intensity of light existing between two cross Polaroids kept with their axes perpendicular to each other. A third polaroid is introduced between them. What must be the angle between the axes of first and the newly introduced polaroid to get the maximum light from the whole arrangement?

  8. The reflected light is found to be plane polarised when an unpolarized light falls on a denser medium at 60° with the normal. Find the angle of refraction and critical angle of incidence for total internal reflection in the denser to rarer medium reflection.

  9. The near point and the far point for a person are 50 cm and 500 cm, respectively. Calculate the power of the lens the person should wear to read a book held in hand at 25 cm. What maximum distance is clearly visible for the person with this lens on the eye?

  10. An unpolarised light of intensity 32 Wm–2 passes through three Polaroids such that the axes of the first and the last Polaroids are at 90°. What is the angle between the axes of the first and middle Polaroids so that the emerging light has an intensity of only 3 Wm–2?

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