Tag: beam of light

Questions Related to beam of light

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

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

  1. True

  2. False

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Correct Option: A
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.

Which of the following is the sources of light?

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

  1. Lamp

  2. Tube light

  3. CFL

  4. All of the above

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Correct Option: D
Explanation:

Lamp, tube light and CFL emit light radiation in visible spectrum when they glow. So they are the sources of light.

Which of the following is true about observation of light?

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

  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

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Correct Option: D
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.

Which of the following is not the sources of light?

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

  1. Candle

  2. Black body

  3. Sun

  4. Bulb

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Correct Option: B
Explanation:

Candle, sun and bulb emit light radiation when they glow, so they are the sources of light. But black body do not emit light and thus is is not a source of light.

In which of the following natural light can be observed?

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

  1. Tube light

  2. Bulb

  3. Sun

  4. Moon

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Correct Option: C,D
Explanation:

Sun and moon are the natural sources of light whereas tube light and bulb are the man made sources of light.

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

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

  1. Streamlines in fluid flow

  2. Lines of forces in electrostatics

  3. Rays in geometrical options

  4. Lines of force in magnesium

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Correct Option: C
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.

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

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

  1. moves away from the slab

  2. moves towards the slab

  3. remains at the some point

  4. undergoes a lateral shift

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Correct Option: A

 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? 

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

  1. Glass slab $(\mu =1.5)$

  2. water $(\mu =1.33)$

  3. Fibre slab $(\mu =1.65)$

  4. Alcohol slab $(\mu =1.36)$

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Correct Option: B

Sun rays on the surface of the earth

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

  1. form convergent beam

  2. form divergent beam

  3. form parallel beam

  4. None of these

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Correct Option: C

A wave $ y = 10 sin (ax + bt) $ is reflected fron a dense medium at an origin. if 81% of energy is reflected thn the equation of reflected wave is :

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

  1. y= sin -8.1 sin (ax - bt)

  2. y= sin 8.1 sin (ax - bt)

  3. y= sin -9 sin (ax - bt)

  4. y= sin 10 sin (ax - bt)

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Correct Option: B