Tag: physics

Questions Related to physics

Which objects use the reflection of light?

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. Sun glasses

  2. Periscope

  3. Mirror

  4. Side mirror of a car

Show answer
Correct Option: B,C,D
Explanation:

Periscope, mirror, side mirror of a car use the reflection of light phenomenon.

An ideal mirror :

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. Absorbs all the amount of light incident on it

  2. Refracts all the light

  3. Reflects all the light

  4. None of the above

Show answer
Correct Option: C
Explanation:

An ideal mirror is defined as object having a reflecting surface so smooth that it reflect back all the light rays striking without any absorbance and emiittance.

Which of the following statement is/ are correct?
I. A person suffering from myopia can see distant obhects clearly.
II.. The bluish color of water in deep sea is only due to reflection of sky in water.
III. In vacuum, all the colored of the light move with the same speed.
IV. At noon, the sun appears white as light is least scattered

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. I only

  2. II only

  3. I and II only

  4. III and IV only

Show answer
Correct Option: C
Explanation:

Myopia is the inability to see objects clearly when they're too far away. People with myopia can often read or see items within a few feet of their face, but distant objects appear blurred. This condition usually develops in an eyeball that's too long from front to back.

The ocean looks blue because red, orange and yellow (long wavelength light) are absorbed more strongly by water than is blue (short wavelength light). So when white light from the sun enters the ocean, it is mostly the blue that gets returned.

The laws of reflection are true for

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. the plane mirror only

  2. the concave mirror  and convex mirror

  3. the convex mirror only

  4. all reflecting surfaces

Show answer
Correct Option: D
Explanation:

It is a fact that laws of reflection are applicable to all reflecting surfaces.

Shaving mirrors are

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. convex mirrors

  2. concave mirrors

  3. plane mirrors

  4. none of the above

Show answer
Correct Option: B
Explanation:

Shaving mirrors are concave mirror, so that when you keep your face near to the focus of the mirror, you get a magnified image.

If a ray of light incident on a plane mirror is such that it makes an angle of $30^{\circ}$ with the mirror, then the angle of reflection is

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. $30^{\circ}$

  2. $45^{\circ}$

  3. $55^{\circ}$

  4. $60^{\circ}$

Show answer
Correct Option: D
Explanation:

if angle with the mirror = $30^o$ then angle with the normal = $90^o - 30^o$ = 60$^o$

hence ans. is D

The angle between the original path of the incident ray and the emergent ray coming out of a prism is called angle of

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. incidence

  2. reflection

  3. prism

  4. deviation

Show answer
Correct Option: D
Explanation:

Angle of deviation is defined as the angle between incident ray and emergent ray or reflected ray.

The phenomenon that leads to the bouncing back of light rays is called-

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. Diffraction

  2. Reflection

  3. Dispersion

  4. Refraction

Show answer
Correct Option: B
Explanation:
$ \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{Dispersion} $ is the phenomenon of splitting of white light into its component colours (VIBGYOR) on passing through a glass prism.

$ \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.

Hence, the correct answer is OPTION B. 

The phenomenon in which light that strikes a surface is thrown back into the same medium is called -

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. reflection

  2. reflex action

  3. refraction

  4. regression

Show answer
Correct Option: A
Explanation:
$ \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. 

A $\bf{Reflex\ action} $ is an involuntary and nearly instantaneous movement in response to a stimulus.
 

$ \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{Regression} $ is a technique for determining the statistical relationship between two or more variables where a change in a dependent variable depends on the change in one or more independent variables.

Hence, the correct answer is OPTION A. 

The bouncing of a beam of light from a polished surface in some other direction is called -

physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

  1. refraction

  2. reflection

  3. dispersion

  4. scattering

Show answer
Correct Option: B
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{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{Dispersion} $ is the phenomenon of splitting of white light into its component colours (VIBGYOR) on passing through a glass prism.

$\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 interaction with the particles of the medium.

Hence, the correct answer is OPTION B.