Tag: terms related with reflection

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Questions Related to terms related with reflection

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

Reflection can occur on

  1. Transparent surfaces

  2. Translucent surfaces

  3. Opaque surfaces

  4. B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Objects which allow the light to pass through them completely without any obstruction are called $ \bf{transparent} $ objects.
Objects which allow the light to pass through them partially are called $ \bf{translucent} $ objects.
Objects which do not allow the light to pass through them are called $\bf{opaque} $ objects.

Since, transparent objects allow light to pass through them completely, no reflection can occur on them. 

Reflection occurs on translucent surfaces because they reflect a certain amount of light while allowing a certain amount of light to be transmitted. Reflection occurs perfectly on Opaque surfaces because they reflect all the light that falls on them without allowing any light to pass through them.

Hence, the correct answer is OPTION D.
Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

Which of the following is the main reason of Opacity of light waves.

  1. reflection

  2. absorption

  3. refraction

  4. diffusion

  5. transmission
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Objects are visible to the eye when light strikes the surface and reflects back itself into the eye. Opaque objects show this phenomenon.

However in the transparent objects, the incident light on their surface gets transmitted, hence does not reflect back to eye and appear transparent.

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

A ray of light striking a plane mirror at an angle of 35 degrees with the normal.

Find out the angle of reflection with normal.

  1. 35 degrees.

  2. 55 degrees.

  3. 10 degrees

  4. 90 degrees

  5. 125 degrees
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Angle of incidence    $i = 35$ degrees

According to Snell's law of reflection, the angle of incidence is equal to the angle of reflection.
$\implies$ Angle of reflection      $r = i = 35$  degrees

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

When a light ray falls on a perfectly reflective mirror at an angle. Identify which of the following statement is true about the ray?

  1. The frequency of the light ray changes

  2. The wavelength of the light ray changes

  3. The velocity of the light ray changes

  4. The period of the light ray changes

  5. The direction of motion of the light ray changes
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

When a light ray falls on a perfectly reflective mirror at some angle, then only the direction of the light rays changes such that the angle of incidence is equal to the angle of reflection but the frequency, wavelength, time period and the velocity of the light remain constant.

Thus option E is correct.

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

Identify on which of the following, specular reflection would most likely to occur. 

  1. mirror

  2. wall

  3. sheet of paper

  4. ceiling.

  5. cat's fur
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The back of a mirror is usually covered with some sort of darkly colored, protective material to stop the silver coating from getting scratched, and also to reduce the risk of any light seeping through from behind. Silver reflects light better than almost anything else and that's because it gives off almost as many light as fall on it in the first place.

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

In which of the following conditions diffuse reflection takes place?

  1. When a parallel beam of light is reflected by a plane mirror.

  2. When a parallel beam of light is reflected by a highly polished metal surface.

  3. When a parallel beam of light is reflected by a paper sheet.

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Diffuse reflection occurs when light hits a rough or irregular surface, causing it to scatter in many directions. A paper sheet has a microscopically rough surface compared to mirrors or polished metal, which produce specular reflection.

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

A person has a $18$cm wide face and his two eyes are separated by 8 cm.Find the minimum width of a mirror required for the person to view is face laterally is

  1. $9$cm
  2. $4$cm
  3. $5$cm
  4. $13$cm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For minimum width -

i). Center of face and mirror must lie in perpendicular bisector of the line joining two eyes.
ii). Left eye must see right end point of face at the end of the mirror.
iii). Night eye must see left end point of face at then end of the mirror.
Now let, 
$F _1,F _2$ end points of face width $11E _1,E _2$ two eyes $11C-$ center of face.
$m _1.m _2-$ mirror end points
$m _1,m _2-$ projection of $m _1m _2$ on line joining two eyes.
Now, line joining two eyes should look like -
$F _1--E _1---m _1-C---m _2----E _2---F _2$
Due to symmetry,
$\Rightarrow F1E2=E1F2=13cm$
Also, $m _1,m _2$ must be midpoint of $F1E2$ and $E1F2$ respectively.
So, $E1m2=m1E2=\dfrac{13}{2}=6.5$
$E1m2=6.5$
$\Rightarrow E1C+Cm2=6.5$
     $4+Cm2=6,5$
     $Cm2=2.5$
similarly $m1C=2.5$
$\Rightarrow m1m2=m1C1C2=5cm=$ mirror width.
Hence, the answer is $5cm.$

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

A beam of light converges at point $P$. Now, a plane mirror is placed $20 \mathrm { cm }$ before the converging point $P$. The new converging point is

  1. $20 \mathrm { cm }$ infront of the mirror
  2. $20 \mathrm { cm }$ behind the mirror
  3. The separation between new converging point and previous converging point is $40 \mathrm { cm } $

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A converging beam directed at a point 20 cm behind a mirror will reflect and converge at a point 20 cm in front of the mirror due to the law of reflection. The mirror effectively flips the virtual image of the convergence point.

Multiple choice physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

What is the correct definition of reflectance?

  1. Difference between amount of light absorbed by the surface and amount of light reflected.

  2. The amount of light reflected by a surface is known as reflectance.

  3. The ratio of the amount of the light reflected from a surface to the amount of light falling on the surface is called reflectance.

  4. The ratio of amount of light falling on a surface to the amount of light reflected on the surface is called reflectance.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

According to definition, ratio of the amount of light reflected from a surface to the amount of light falling on the surface is called reflectance.