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Physical optics
5 Class 11 Physics questions with answers and explanations.
Printable worksheet with answer key
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Interference of light provides evidence that light behaves as a:
- 1 Wave
- 2 Particle
- 3 Neutral object
- 4 Sound
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In Young's double slit experiment, the fringe spacing is proportional to:
- 1 Wavelength
- 2 Intensity
- 3 1 / wavelength
- 4 Slit width only
Show answer
Correct answer: Wavelength
Fringe spacing = wavelength x distance to screen / slit separation.
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Polarisation shows that light waves are:
- 1 Transverse
- 2 Sound like
- 3 Longitudinal
- 4 Neutral
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A diffraction grating has 5000 lines per cm. The grating spacing is:
- 1 5 x 10^-3 m
- 2 2 x 10^-6 m
- 3 5 x 10^-6 m
- 4 2 x 10^-4 m
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Correct answer: 2 x 10^-6 m
d = 1 / 5000 cm = 2 x 10^-4 cm = 2 x 10^-6 m.
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Newton's rings are produced by:
- 1 Polarisation
- 2 Dispersion
- 3 Reflection only
- 4 Thin film interference
Show answer
Correct answer: Thin film interference
They form from interference in the thin air film between a lens and a plate.