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LAWS OF REFLECTION...

LAWS OF REFLECTION

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First law of reflection states that incident ray, reflected ray and normal all lie in same plane. Second law of reflection states that angle of incidence is equal to angle of reflection.
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Knowledge Check

  • STATEMENT- 1 Law of reflection is applicable for all type of mirrors. STATEMENT 2 Rays which are parallel to principal axis are known as paraxial rays.

    A
    STATEMENT -`1`is true statement `2` is true,Statement -`2`is a correct explanation for statement -`1`
    B
    STATEMENT -`1`is true statement `2` is true,Statement -`2`is a not a correct explanation for statement -`1`
    C
    Statement -`1`is true,Statement -`2`is False
    D
    Statement -`1`is False ,Statement -`2`is True

  • STATEMENT-1 The formula connecting u,v and f for a spherical mirrors whose sizes are very small compared to their radii of curvature. STATEMENT-2 Laws of reflection are strictly valid for plane surfaces, but not for large spherical surfaces.

    A
    Statement-`1` is True, Statement-`2` is True, Statement-`2` is a correct explanation for Statement -`1`
    B
    Statement-`1` is True, Statement-`2` is True, Statement-`2` is `NOT` a correct explanation for Statement -`1`
    C
    Statement-`1` is True, Statement-`2` is False
    D
    Statement-`1` is False, Statement-`2` is True.

  • Assertion : Focal length of a spherical mirror does not depend on the material from which mirror is made but same for the lens depends on the material of lens. Reason : Law of reflection does not depend on material and surrounding medium but law of refraction depends on refractive index of the materials.

    A
    If both assertion and reason are correct and rason is a correct explanation of the assertion.
    B
    If both assertion and reason are correct but reason is not the correct explanation of assertion.
    C
    If assertion is correct but reason is incorrect.
    D
    If assertion is incorrect but reason is correct.

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    Arrange the following steps in a sequential order to verify the laws of reflection. (A) A hard , smooth surface (AB) is mounted vertically over a horizontal board on which two tubes P and Q , point towards the surface AB. (B) The tube Q is adjusted such that the listener would be able to hear the ticking sound clearly at the end away from AB. (C) The sound waves from a source , like ticking clock are directed to the surface AB through the pipe P inclined at an angle to AB . (D) By measuring the angles the tubes make with the surface AB , the laws of reflection are verified .

    Write the following steps in sequential order to verify the laws of reflection. (A) Draw a normal at the point where the two lines PQ and P, Q, meet. (B) Remove the pins and the mirror and join P, Q similarly join P.Q. (C) View the image of P and Q and fix two more pins P, and Q, such that the images of pins P, Q and P, Q are along the same line. (D) Draw a straight line on a white paper spread on the table and fix a plane mirror on the line. (E) Fix two pins P and Q in front of the mirror. (F) Measure the angle of incidence and angle of reflection and compare them to verify the law reflection

    Statement I : Light reflected from any surface obeys the law of reflection. Statement II: Distance measured in the direction of light are taken as positive.

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