Tag: how light travels

Questions Related to how light travels

The path along which light travels in a homogeneous medium is called a :

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. beam of light

  2. ray of light

  3. pencil of light

  4. line of light

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Correct Option: B
Explanation:

The path along which light travels in a homogeneous medium is called a ray of light

Light waves:

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. require air or another gas to travel through

  2. require an electric field to travel through

  3. require a magnetic field to travel through

  4. can travel through perfect vacuum

Show answer
Correct Option: D
Explanation:

Light is an electromagnetic wave which is transverse in nature. It does not require any material medium to pass through and can travel through vacuum.

Which of the following is a non-luminous body ?

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. Sun

  2. Moon

  3. Candle flame

  4. Electric lamp

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Correct Option: B
Explanation:

Moon does not emit its own light. It reflects the light incident on it from the Sun. So, Moon is a non-luminous body.

Find out the only wrong statement in the following:

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. Light travels with a speed greater than that of sound

  2. Light cannot travel through vacuum

  3. Light travels in a straight line

  4. Light has no weight

Show answer
Correct Option: B
Explanation:

Light is an electromagnetic wave which is transverse in nature. So, it does not require any material medium to pass through. Light, thus, can travel through vacuum.

A green leaf placed in a dark room is illuminated by red light. The leaf will appear to be :

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. green

  2. red

  3. yellow

  4. black

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Correct Option: D
Explanation:

A green leaf can only reflect green light, so when red light is incident on it, the leaf will not be able to reflect any light making it look black

The path along which light travels in a homogenous medium is called the

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. beam of light

  2. ray of light

  3. pencil of light

  4. none of these

Show answer
Correct Option: B
Explanation:

Definition:- The path a traced by light is called a ray of light. 

We can see an object from every direction due to ____________ of the incident light ray on the object.

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. regular refraction

  2. regular reflection

  3. irregular reflection

  4. none of these

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Correct Option: C
Explanation:

Irregular reflection makes us see all the objects and everything around us. If light gets regularly reflected then every object would act like a mirror and our surroundings would be illuminated. This would have a blinding effect on eyes making it harder for us to see.

A leaf which contains only green pigments, is illuminated by a laser light of wave length 0.6328 $\mu$ m. It wound appear to be:

evs light and shadow nature and sources of light how light travels path of light elementary ideas of astronomy

  1. Brown

  2. Black

  3. Red

  4. Green

Show answer
Correct Option: B
Explanation:

0.6328 $\mu m$ = $6328 \mathring A$
This is wavelength of red colour. So, this light will be absorbed by green pigments. 
The leaf will appear black.