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Introduction to reflection of light - class-VII

introduction to reflection of light

17 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

For a total internal reflection, which of the following is correct?

  1. Light travel from rarer to denser medium.
  2. Light travel from denser to rarer medium.
  3. Light travels in air only.
  4. Light travels in water only.
Question 2 Multiple Choice (Single Answer)

If the angle of incidence is $70^o$, then calculate the angle between the incidence ray and the reflected ray.

  1. $40^o$
  2. $140^o$
  3. $130^o$
  4. $110^o$
Question 3 Multiple Choice (Multiple Answers)

Which objects use the reflection of light?

  1. Sun glasses
  2. Periscope
  3. Mirror
  4. Side mirror of a car
Question 4 Multiple Choice (Single Answer)

An ideal 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
Question 5 Multiple Choice (Single Answer)

The laws of reflection are true for

  1. the plane mirror only
  2. the concave mirror and convex mirror
  3. the convex mirror only
  4. all reflecting surfaces
Question 6 Multiple Choice (Single Answer)

Shaving mirrors are

  1. convex mirrors
  2. concave mirrors
  3. plane mirrors
  4. none of the above
Question 7 Multiple Choice (Single Answer)

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

  1. $30^{\circ}$
  2. $45^{\circ}$
  3. $55^{\circ}$
  4. $60^{\circ}$
Question 8 Multiple Choice (Single Answer)

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

  1. Diffraction
  2. Reflection
  3. Dispersion
  4. Refraction
Question 9 Multiple Choice (Single Answer)

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

  1. reflection
  2. reflex action
  3. refraction
  4. regression
Question 10 Multiple Choice (Single Answer)

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

  1. refraction
  2. reflection
  3. dispersion
  4. scattering
Question 11 Multiple Choice (Single Answer)

According to the laws of reflection, angle of incidence is equal to angle of reflection.

  1. True
  2. False
Question 12 Multiple Choice (Single Answer)

The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ___________.

  1. Reflection
  2. Refraction
  3. Dispersion
  4. None
Question 13 Multiple Choice (Single Answer)

Which objects use the reflection of light?

  1. Side mirror of a car
  2. Periscope
  3. Mirror
  4. All of the above
Question 14 Multiple Choice (Single Answer)
A light ray makes an angle of incidence $60^o$, when it falls on a plane reflecting sheet.
The angle of reflection will be.
  1. $60^o$
  2. $30^o$
  3. $45^o$
  4. $90^o$
Question 15 Multiple Choice (Single Answer)

Riya and Priya were sitting around a round table. They noticed that they could see their own and each other's image onto the table top. Then table top is made of

  1. Unpolished wood, covered with white cloth
  2. Polished glass of red colour
  3. Glass covered with cellophane paper
  4. Smoked glass covered with green colour cloth.
Question 16 Multiple Choice (Single Answer)

Reflection is

  1. Bending of ray of light.
  2. Bouncing back of ray of light.
  3. Light travelling in a straight line.
  4. None of these.
Question 17 Multiple Choice (Single Answer)

A ray of light is incident on a plane mirror along a vector $\hat i+\hat j-\hat k$. The noemal on incident point is along $\hat i+\hat j$. Then unit vector along the reflected ray is:

  1. $ \dfrac { 1 }{ \sqrt { 3 } } \left( \hat { i } +\hat { j } +\hat { k } \right)$
  2. $-\dfrac { 1 }{ \sqrt { 3 } } \left( \hat { i } +\hat { j } +\hat { k } \right)$
  3. $ \dfrac { 1 }{ \sqrt { 3 } } \left( -\hat { i } -\hat { j } +\hat { k } \right)$
  4. $ \dfrac { 1 }{ \sqrt { 3 } } \left( -\hat { i } +\hat { j } +\hat { k }\right)$
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