Tag: reflection of light and shadow

Questions Related to reflection of light and shadow

Irregular reflection occurs due to:

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. failure of laws of reflection

  2. irregularity in reflecting surface

  3. irregular light

  4. all of these

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Correct Option: B
Explanation:

Irregular reflection occurs when parallel rays of light are incident on an irregular or rough surface and after reflection emerge in different directions. This type of reflection occurs due to irregularity of the reflecting surface.

Regular reflections occur from smooth or polished surfaces.

Moon is visible to us because:

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. it reflects light

  2. it refracts light

  3. it emits light

  4. it absorbs light

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Correct Option: A
Explanation:

We see an object when light comes from the same. As moon is not a natural source of light, it reflects light rays from the Sun and we are able to see it.

When all the parallel rays reflected from a plane surface are parallel, the reflection is known as:

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. regular reflection

  2. irregular reflection

  3. diffused reflection

  4. none of these

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Correct Option: A
Explanation:

When all the parallel rays reflected from a plane surface are parallel, the reflection is known as regular reflection .

Which of the following can form image?

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. Diffused reflection

  2. Irregular reflection

  3. Regular reflection

  4. All of these

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Correct Option: C
Explanation:

Images are formed by regular reflection. Diffused or irregular reflections can not form images.

Mark the statement which is true for diffused reflection:

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. Diffused reflection is due to failure of laws of reflection

  2. It is caused due to irregularities in the reflecting surface

  3. When the incident light is diffused in nature it causes diffused reflection

  4. All are true

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Correct Option: B
Explanation:

Diffused reflection is not due to failure of laws of reflection but it is due to irregularities in the reflecting surface, like that of cardboard.

Why we are not able to see our image on a cardboard even though it reflects light?

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. Because cardboard does not shine like mirror

  2. Because cardboard is not as durable as mirror

  3. Because cardboard's surface is irregular

  4. All

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Correct Option: C
Explanation:

We can"t see our image on a cardboard because cardboard"s surface is rough and the reflection occurring on uneven surface is irregular reflection. So, the rays, after reflection, move to different directions. Images are not formed due to irregular reflections.

Which of the following is /are type of reflection ?

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. Regular reflection

  2. Irregular reflection

  3. Diffused reflection

  4. All of the above

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Correct Option: D
Explanation:

There are two kinds of reflection
i)regular reflection
ii)irregular reflection

When light is incident on a polished surface ___________ reflection takes place.

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. regular

  2. irregular

  3. both (a) and (b)

  4. None of these

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Correct Option: A
Explanation:

Regular reflection takes place when a light beam is incident on a smooth surface which is highly polished.

Which surfaces will reflects most of the light falling on them?

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. Flat surface

  2. Shiny surface

  3. Smooth surface

  4. Opaque surface

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Correct Option: B
Explanation:

A perfect smooth and shiny surface will reflect most of the light falling on them.

A bus driver is reversing his bus at a speed $8 m s^{-1}$. The rear view mirror of a bus is a plane mirror. The driver sees in his rear view mirror the image of a car parked behind his bus. The speed at which the image of the car appears to approach the driver will be

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. $2 m s^{-1}$

  2. $4 m s^{-1}$

  3. $8 m s^{-1}$

  4. $16 m s^{-1}$

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Correct Option: D
Explanation:

The speed at which the image of the car appears to approach the driver will be $(2 \times 8) m s^{-1} = 16 m s^{-1}$ because rear view mirror is a plane mirror.