Tag: magic with mirrors

Questions Related to magic with mirrors

A beam of light consists of a bundle of light rays.

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

  1. True

  2. False

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Correct Option: A
Explanation:

A group of light rays is called a beam of light.

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

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

  1. Newton's rings.

  2. rectilinear propagation of light.

  3. colour through thin films.

  4. Dispersion of white light into colours.

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Correct Option: B
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.

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:

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

  1. $4\pi nR$

  2. $2\pi nR$

  3. $nR/2\pi$

  4. $nR/4\pi$

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Correct Option: A

Angle of incidence is equal to the angle of reflection.

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

  1. Always

  2. Sometimes

  3. Under special condition

  4. Never

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Correct Option: A
Explanation:

As per the low of reflection the angle of incident is always equal to angle 

of reflection.
Hence option $A$ is correct answer.

Newton's corpuscular model of light.

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

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Correct Option: A

Parallel beam is

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

  1. produced by a source at infinity

  2. produced by a source at finite distance

  3. produced by a virtual source

  4. None of these

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Correct Option: A

While moving from deep water to shallow water.

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

  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

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Correct Option: C

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

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

  1. Candle power

  2. Lux

  3. Both A & B

  4. None of the above

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Correct Option: C
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

Which of the following statements applies to light?

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

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Correct Option: C
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.

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

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

  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.

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Correct Option: A
Explanation:

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