Tag: nature and sources of light

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Multiple choice evs light and shadow dual nature of light nature and sources of light theories on light

By corpuscular theory of light, the phenomenon which can be explained is ____________.

  1. refraction

  2. diffraction

  3. interference

  4. polarisation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Refraction

According to newton, when corpuscles approach the refracting surface , they are attracted near the surface. When they enter the denser medium from a rarer medium, their speed increases and hence change their direction.

Multiple choice evs magic with mirrors dual nature of light nature and sources of light theories on light

Newton postulated his corpuscular theory of light on the basis of:

  1. Newton's rings.

  2. rectilinear propagation of light.

  3. colour through thin films.

  4. Dispersion of white light into colours.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to Isaac Newton the geometric nature of reflection and refraction of light could only be explained if light was made of particles, referred to as corpuscles that travel in straight line.

Multiple choice evs magic with mirrors dual nature of light nature and sources of light theories on light

A small plane mirror is placed at the center of the spherical screen of radius R. A beam of light is falling on the mirror. If the mirror makes n revolutions per second, the speed of light on the screen after reflection from the mirror will be:

  1. $4\pi nR$
  2. $2\pi nR$
  3. $nR/2\pi$
  4. $nR/4\pi$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a mirror rotates at n revolutions per second, the reflected beam rotates at 2n revolutions per second. The spot on the screen moves at a speed of v = omega * R = (2 * pi * 2n) * R = 4 * pi * n * R.

Multiple choice evs magic with mirrors dual nature of light nature and sources of light theories on light

Newton's corpuscular model of light.

  1. successfully explain the rectilinear propagation of light, reflection of light and refraction of light

  2. does not explain the phenomena of interference of light, diffraction of light and polarisation of light

  3. is based upon particle theory of light

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Newton's corpuscular theory successfully explained rectilinear propagation, reflection, and refraction, but failed to explain interference, diffraction, and polarization.