Tag: what makes things visible

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Multiple choice evs light and shadow what makes things visible nature and sources of light light travels in straight line

The amount of light reflected depends upon

  1. the nature of material of the object

  2. the nature of the surface

  3. the smoothness of the surface

  4. all the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The amount of light reflected depend upon the properties of the material and the surface polished.Hence reflection depends upon the smoothness of the material at which light is incident.

Multiple choice evs light and shadow what makes things visible nature and sources of light light travels in straight line

The ray of light which falls on a mirror is called-

  1. Reflected ray

  2. Emergent ray

  3. Incident ray

  4. Transmitted ray
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A $ \textbf{reflected ray}$ is a ray of light that represents the light reflected by the surface or the ray of light that bounces off the mirror.

An $ \textbf{emergent ray} $ is a ray of light which finally emerges out of the other medium back to the original medium.

An $\textbf{incident ray}$ is a ray of light approaching the mirror or falling on the mirror.

A $\textbf{transmitted ray} $ or a refracted ray is a ray of light that is transmitted into the second medium and undergoes a change of velocity and direction due to the interaction with the material medium in which it travels.

Hence, the correct answer is OPTION C. 

Multiple choice evs light and shadow what makes things visible nature and sources of light light travels in straight line

Objects which emit light of their own are called -

  1. non- luminous objects

  2. transparent objects

  3. translucent objects

  4. luminous objects
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Objects which do not emit light on their own are called  $ \bf{non-luminous}$ objects.

Objects which allow the light to pass through them completely without any obstruction are called $ \bf{transparent} $ objects.

Objects which allow the light to pass through them partially are called $ \bf{translucent} $ objects.


Objects that give out or emit light of their own are called as $ \bf{luminous} $ objects. 

Hence, the correct answer is OPTION D. 

Multiple choice evs light and shadow what makes things visible nature and sources of light light travels in straight line

Reflection of the Sun's light from the upper layers of the Earth's atmosphere causes.

  1. day and night

  2. tides

  3. eclipses

  4. twilight
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Twilight on Earth is the illumination of the lower atmosphere when the Sun itself is not directly visible because it is below the horizon. Twilight is produced by sunlight scattering in the upper atmosphere, illuminating the lower atmosphere so that Earth's surface is neither completely lit nor completely dark.