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NDA - Optics Test 1426
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NDA - Optics Test 1426
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  • Question 1/5
    1 / -0.33
    According to the law of reflection, ______________.
    Solutions
    Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves.
    The law of reflection states that the incident ray, the reflected ray, and the normal to the surface of the mirror all lie in the same plane. Furthermore, the angle of reflection is equal to the angle of incidence.
  • Question 2/5
    1 / -0.33
    Reflection from a smooth surface like that of a mirror is called ___________ reflection.
    Solutions
    When a beam of parallel light rays is incident on a smooth and plane surface, the reflected rays will be parallel. It is called regular reflection. When a beam of parallel light rays is scattered in all direction it means surface is not smooth . it is called irregular or diffused reflection. In regular reflection , the reflected rays of light move only in a fixed direction.
  • Question 3/5
    1 / -0.33
    Which among the following statements is/are false regarding laws of reflection?
    Solutions
    There are two laws of reflection which are as follows:
    First Law of Reflection: The incident ray, the reflecting ray and normal at the point of incidence; all lie in the same plane.
    Second Law of Reflection: Angle of incidence is always equal to the angle of reflection
  • Question 4/5
    1 / -0.33
    Which of the following is incorrect about reflection of light?
    Solutions

    When the surface is rough on which the light falls, the light gets reflect back in different direction and this is known as Diffuse Reflection.

  • Question 5/5
    1 / -0.33
    The reflection formed by the plane mirror is ________.
    Solutions
    The reflection formed by the plane mirror is lateral inversion. Due to lateral inversion left side appear right and vice versa, the best example for this phenomena is shaving mirror , in which both side reversed. Plane mirrors are the only type of mirror for which a real object always produces an image that is virtual, erect and of the same size as the object
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