Tag: ray and beam

Quizzes (0) Questions (23)

Questions Related to ray and beam

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.

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

Which of the following is true about observation of light?

  1. When we switch on the torch we can observe the beam of light

  2. Sun light can be observed in early morning when sun rises

  3. We can observed beam of light of sun through a hole

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

All the three statements are true that light is observed when switching on the torch, sunlight is observed in early morning and a beam of light can be observed through a hole.

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

Physical processes are sometimes described visually by lines. Only the following can cross.

  1. Streamlines in fluid flow

  2. Lines of forces in electrostatics

  3. Rays in geometrical options

  4. Lines of force in magnesium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Since in case of reflection or reflection of light rays, the image formation is the meeting/crossing of light ray's through a point.

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

A glass slab is placed in the path of convergent light.. The point of convergence of light .......... .

  1. moves away from the slab

  2. moves towards the slab

  3. remains at the some point

  4. undergoes a lateral shift
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a convergent beam of light passes through a glass slab, the light rays are refracted towards the normal upon entering and away from the normal upon exiting. This causes the point of convergence to shift further away from the slab.

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

 A beam of light passes through layers of following different substances each 10 cm thick normally. In which substance does the beam take more to pass through? 

  1. Glass slab $(\mu =1.5)$
  2. water $(\mu =1.33)$
  3. Fibre slab $(\mu =1.65)$
  4. Alcohol slab $(\mu =1.36)$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The time taken by light to pass through a substance of thickness d is given by t = distance / speed = (mu * d) / c. Since the thickness is the same for all, the time taken is directly proportional to the refractive index mu. The fibre slab has the highest refractive index (1.65), so the light takes the most time to pass through it.