اردو

Home / Practice / Physical optics / Worksheet

Practise online

Physical optics

Class 11 · Physics · 5 questions

Name: ____________________   Date: ____________

  1. Interference of light provides evidence that light behaves as a:

    • A Wave
    • B Particle
    • C Neutral object
    • D Sound

  2. In Young's double slit experiment, the fringe spacing is proportional to:

    • A Wavelength
    • B Intensity
    • C 1 / wavelength
    • D Slit width only

  3. Polarisation shows that light waves are:

    • A Transverse
    • B Sound like
    • C Longitudinal
    • D Neutral

  4. A diffraction grating has 5000 lines per cm. The grating spacing is:

    • A 5 x 10^-3 m
    • B 2 x 10^-6 m
    • C 5 x 10^-6 m
    • D 2 x 10^-4 m

  5. Newton's rings are produced by:

    • A Polarisation
    • B Dispersion
    • C Reflection only
    • D Thin film interference

Answer key

1. A, 2. A, 3. A, 4. B, 5. D

  1. Interference is a wave property.

  2. Fringe spacing = wavelength x distance to screen / slit separation.

  3. Only transverse waves can be polarised.

  4. d = 1 / 5000 cm = 2 x 10^-4 cm = 2 x 10^-6 m.

  5. They form from interference in the thin air film between a lens and a plate.