Tag: physics

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Questions Related to physics

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

If a parallel beam of light having intensity I is incident normally on a perfectly reflecting surface, the force exerted on the surface, equal F. When the surface is held at an angle $ \theta $ the force is 

  1. $ 2F tan \theta $

  2. $ F cos \theta $

  3. $ F cos^2 \theta $

  4. $ 2 F $
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

The shape of spot light produced when bright sunshine passes perpendicular through a hole of very small size, is:

  1. Square because hole is square

  2. Round because it is an image of the sun

  3. Round with a small pinumbra around it

  4. Square with a small pinumbra
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • The spots are often oval, rather than round. That's because the sunlight is hitting the ground at an angle and the round sun images are stretching out to make ovals.
  • It's perpendicular to the sun's rays, and the spots should become round. 
  •  Hence option B is the right answer

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

A light is said to be divergent when :

  1. all the rays travel parallel to each other

  2. all the rays spread from a point source of light

  3. all the rays converge together to a single point

  4. it travels in an irregular pattern
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the rays of light starting from a point travel in different directions, then the collection of such rays is termed as a divergent beam of light.

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

A light is said to be convergent when :

  1. all the rays travel parallel to each other

  2. all the rays spread form a point source of light

  3. all the rays converge towards a single point

  4. it travels in an irregular pattern
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the rays of light coming from different directions meet at a point, then the collection of such rays is termed as a convergent beam of light.

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

State whether true or false.
When the rays of light starting from a point source travel in various directions, then the collection of such rays is called a convergent beam of light.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the rays of light starting from a point travel in various directions then collection of such rays is called divergent beam of light

Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

A beam of light is made up of:

  1. Rays

  2. Droplets

  3. Clusters

  4. Groups
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A $ \bf{beam\ of\ light}$ is group of rays of light travelling in a particular direction. 
A $ \bf{ray\ of\ light} $ is the direction along which the light energy propagates.

Hence, the correct answer is OPTION A.
Multiple choice physics reflection of light and shadow beam of light ray and beam ray optics

State whether true or false:
In convergent beam of light all the light rays meet at a point.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If a parallel beam of light fall on a converging mirror or lens then they will also pass through focus i.e. all the rays will meet at a point of a convergent beam.