Tag: nature and sources of light

Questions Related to nature and sources of light

The speed at which the current travels in a conductor, is nearly.

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

  1. $3 \times 10^4 ms^{-1}$

  2. $3 \times 10^5 ms^{-1}$

  3. $4 \times 10^6 ms^{-1}$

  4. $3 \times 10^8 ms^{-1}$

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Correct Option: D
Explanation:

The speed of the current in the conductor is the same as the speed of light in the vacuum which is $3\times 10^{8} {\dfrac{m}{s}}$

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

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

  1. refraction

  2. diffraction

  3. interference

  4. polarisation

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Correct Option: A
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.

Light, like sound, cannot pass through vacuum. State whether true or false

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

  1. True

  2. False

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Correct Option: B
Explanation:

Light is a form of energy which doesn't need any medium to propagate.Whereas sound travels via disturbances in the medium.

Light travels in a ________ path

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

  1. rectilinear

  2. zig zag

  3. circular

  4. helical

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Correct Option: A
Explanation:

Light travels in straight line unless it passes through a change in medium.

State whether true or false.
Light is a form of energy that causes a sensation of smell.

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

  1. True

  2. False

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Correct Option: B
Explanation:

Smell sensation is due to chemical present in our atmosphere.

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