Tag: laws of reflection

Questions Related to laws of reflection

You are given four sources of light each one providing a light of a single colour red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90. Which of the following statements is correct, if the source of yellow light is replaced with that of other lights without changing the angle of incidence?

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

  1. The beam of red light would undergo total internal reflection.

  2. The beam of red light would bend towards normal while it gets refracted through the second medium.

  3. The beam of blue light would undergo total internal reflection.

  4. The beam of green light would bend away from the normal as it gets refracted through the second medium.

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Correct Option: C
Explanation:

For yellow light, r=90$^{\circ}$, when $i=c$ since $i$ is kept $c$ should be smaller for total reflection

$\mu = \cfrac{1}{\sin{c}}$ 
If $c$ is small, $\mu$ will be large.
$\therefore c $ will be smallest for this colour.
Hence, blue colour will undergo total internal reflection.

A real image is formed when two or more

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

  1. reflected rays meet

  2. refracted rays meet

  3. reflected rays appear to meet

  4. rays actually meet

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Correct Option: A,B,D
Explanation:

the real image is formed when two or more reflected or refracted rays actually meet at a point.

Select the odd one out w.r.t. the type of reflection of incident light

(wood, steel, silver, mirror, graphite)

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

  1. mirror

  2. wood

  3. silver

  4. steel

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Correct Option: A
Explanation:

Except mirror all other causes irregular reflection

State whether true or false.
Regular reflection takes place when the light beam falls on a highly polished surface.

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

  1. True

  2. False

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Correct Option: A
Explanation:

A highly polished surface acts like a reflecting surface which allows regular reflection to take place.

State whether true or false.
Regular reflection is produced when light falls on the rough walls.

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

  1. True

  2. False

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Correct Option: B
Explanation:

Regular reflection is produced when light falls on highly polished surface.

Regular reflection takes place when light is incident on:

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

  1. a rough curved surface

  2. a highly polished plane surface

  3. either of A and B

  4. neither of A and B

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Correct Option: B
Explanation:

When parallel rays of light are incident on a highly polished plane surface, after reflection, the rays emerge parallel as well. This type of reflection is called regular reflection.

Type of reflection in which images are formed and reflection occurs from a smooth surface like that of mirror is known as: 

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

  1. diffused reflection

  2. regular reflection

  3. irregular reflection

  4. none of these

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Correct Option: B
Explanation:

Regular reflection occurs from smooth surfaces and images are formed in this type of reflection.

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 .