Tag: magic with mirrors

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Questions Related to magic with mirrors

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.

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

While moving from deep water to shallow water.

  1. Frequency of the water waves decrease

  2. Frequency of the water waves increase

  3. Frequency of the water waves stays the same

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

The frequency of a wave is determined by the source and remains constant when the wave passes from one medium to another, while speed and wavelength change.

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

Which of the following is a unit for intensity of light?

  1. Candle power

  2. Lux

  3. Both A & B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. The SI unit of luminous intensity is the candela (cd), an SI base unit.
Also, unit for intensity of light are:
(i) Candle Power
(ii) Lux
Multiple choice evs magic with mirrors dual nature of light nature and sources of light theories on light

Which of the following statements applies to light?

  1. Light can only be described as particles.

  2. Light can only be described as waves.

  3. Light can be described as rays, waves and particles.

  4. Light can only be described as rays.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

We can observe various phenomenon of light which cannot be explained by wave nature of light and photon nature of light some of the phenomenon are listed below:
Nature of light:                                          Phenomenon:
Ray                                                                 Reflection, Refraction
Wave                                                               Diffraction, Interference
Particle                                                  Oscillation frequency of radio waves.

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

Which of the following statements about the behaviour of light is not correct?

  1. Interference patterns are evident for light behaving as rays.

  2. Ray properties of light are useful for understanding how images are formed by optical devices such as eyes.

  3. Wave properties are important for observing the behaviour of light at a fine scale.

  4. Both wave and particle theories of light can be related to the colour sensations produced by light.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Interference patterns are explained using wave nature of light. You can learn more from youtube video "Interference of light".