Tag: laws of reflection

Questions Related to laws of reflection

Reflection can occur on :

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

  1. transparent surfaces

  2. glass

  3. opaque surfaces

  4. a and b

Show answer
Correct Option: C
Explanation:

Light can pass through transparent materials, such as glass or air. However it cannot pass through opaque materials and get reflected.

No matter how far you stand from a mirror, your image always appears erect. Then the mirror among the following is likely to be:

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

  1. a plane mirror

  2. a concave mirror

  3. any type of mirror

  4. none of the above

Show answer
Correct Option: A
Explanation:

If the image always appears erect, then the mirror is either plane or convex. So, on the basis of the given options, the mirror is likely to be a plane mirror.

Fill in the blanks to complete the following sentences:


i) A ray travelling towards the mirror is the ______.
ii) Angle between reflected ray and normal is the ___.
iii) The angle between reflecting surface and the reflected ray is the ______.

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

  1. i-incident ray ,ii-angle of reflection ,iii-glancing angle of reflection

  2. i-normal ray ,ii-glancing angle of reflection ,iii-angle of incidence

  3. i-reflected ray ,ii glancing angle of incidence ,iii-glancing angle of reflection

  4. i-reflected ray ,ii-angle of incidence ,iii- angle of reflection

Show answer
Correct Option: A
Explanation:

According to definition, 
i) A ray from the object, travelling towards the mirror is the incident ray.
ii) Angle between reflected ray and normal is the angle of reflection.
iii) The angle between reflecting surface and the reflected ray is known as the glancing angle of reflection.

The ray which bounces off the surface of the mirror when the incident ray strikes the mirror is known as ________.  The point at which incident ray meets the mirror is called the _________.
physics reflection of light and shadow terms related with reflection terms related to reflection of light laws of reflection

  1. normal ray, point of reflection

  2. reflected ray, point of refraction

  3. reflected ray, point of incidence

  4. diffracted ray, point of diffraction

Show answer
Correct Option: C
Explanation:

According to definition of reflected ray and point of incidence, the ray which bounces off the surface of the mirror when the incident ray strikes the mirror is known as the reflected ray. The point at which incident ray meets the mirror is called the point of incidence.

Fill in the blank:

When angle of incidence increases, glancing angle of incidence ________.

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

  1. decreases

  2. increases

  3. remains same

  4. becomes zero

Show answer
Correct Option: A
Explanation:

Angle of incidence $+$ Glancing angle of incidence $=90^0$

So, Glancing angle of incidence $=90^0 -$ Angle of incidence
This means, when angle of incidence increases, glancing angle of incidence decreases,

Fill in the blank:

When the angle of incidence increases, glancing angle of reflection _______.

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

  1. increases

  2. remains same

  3. decreases

  4. becomes infinite

Show answer
Correct Option: C
Explanation:

Angle of incidence $+$ glancing angle of incidence $=90^0$

So, glancing angle of incidence $=90^0 -$ angle of incidence
Now, glancing angle of incidence $=$ glancing angle of reflection
Therefore, glancing angle of reflection $=90^0 -$ angle of incidence
This means, when angle of incidence increases, glancing angle of reflection decreases,

Bouncing of light into the same medium, from which the light ray is incident, is termed as

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

  1. Refraction

  2. Diffraction

  3. Reflection

  4. Scattering

Show answer
Correct Option: C
Explanation:

$ \bf{Refraction} $ of light is the phenomenon of bending of light or change in the direction of light, when it passes obliquely from one transparent medium to another.

$ \bf{Diffraction} $ is the phenomenon of bending of light waves around the corners of an obstacle or aperture, placed in the path of light beam.

$ \bf{Reflection} $ is the phenomenon in which light rays on striking a polished surface(such as a mirror) bounce back or are sent back into the same medium. 

$\bf{Scattering} $ is the phenomenon by which a beam of light is redirected or deflected in many different directions when it passes through an imperfect medium due to the interaction with the particles of the medium.

Hence, the correct answer is OPTION C. 

Reflection can occur on

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

  1. Transparent surfaces

  2. Translucent surfaces

  3. Opaque surfaces

  4. B and C

Show answer
Correct Option: D
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.

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

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

  1. reflection

  2. absorption

  3. refraction

  4. diffusion

  5. transmission

Show answer
Correct Option: A
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.

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.

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

  1. 35 degrees.

  2. 55 degrees.

  3. 10 degrees

  4. 90 degrees

  5. 125 degrees

Show answer
Correct Option: A
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