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A ray of light falling normally on a pla...

A ray of light falling normally on a plane mirror retraces its path on reflection.

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For the ray fallig normally,
`angle i=0^@`
As `angler=anglei=0^@`
`:.` reflected ray retraces its path as shown in fig.
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In case of both, convex mirror and concave mirror, any line passing through centre of curvature of the mirror is normal to the mirror. A ray of light falling normally on the mirror, retraces its path on reflection. This is because for a normaly ray, angle of incidence, anglei=0^@ . As angle of reflection is equal to angle of incidence, i.e., angle r=angle i , therefore, angle r=0^@ . That is why the path of the ray normally on the mirror is retraced. Read the above passage and answer the following questions : (i) Do the rays passing through principal focus of mirror fall normally on the mirror. (ii) Which is closer to the mirror, principal focus or centre of curvature of the mirror ? (iii) What values of life do you learn from this concept?

When a ray of light is incident normally on a plane mirror then the angle of reflection will be

Knowledge Check

  • Consider the following statements. A ray of light incident alone the normal to the plane mirror retraces its path ofter reflection from the mirror. A ray of light alone the normal has angle of incident as pi /2 and hence, reflection from mirror. Choose the correct option from those given below.

    A
    Both I and II are correct
    B
    Both I and II are incorrect
    C
    I is correct and II is incorrect
    D
    I is incorrect and II is correct

  • A ray of light is incident normally on a plane mirrorr. The angle of reflection will be

    A
    `0^(@)`
    B
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    C
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    D
    None of these

  • When two plane mirrors subtend an angle theta between them, then a ray of light incident parallel to one of them retraces its path afer n reflections such that ntheta=c (where c is constant) If the angle between mirrors is 60^(@) . Then light ray retraces its path after n reflections where n is

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    3
    B
    4
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    2
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    A ray incident along normal to the mirror retraces its path. Why ?

    A ray of light passing through centre of curvature of a concave mirror retraces its path on reflection. Why ?

    A ray of light passing through centre of curvature of a spherical mirror retraces its path on reflection from the mirror.

    When two plane mirrors subtend an angle theta between them, then a ray of light incident parallel to one of them retraces its path afer n reflections such that ntheta=c (where c is constant) The graph between theta and n will

    When two plane mirrors subtend an angle theta between them, then a ray of light incident parallel to one of them retraces its path afer n reflections such that ntheta=c (where c is constant) What is the angle of c?

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