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A pencil dipped in water obliquely appea...

A pencil dipped in water obliquely appears bent at the surface of water. Give reason

Text Solution

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(1) When a pencil is partly immersed in water and held in a slanting position, the rays of light coming from the immersed part of the pencil emerge from water (a denser medium) and enter air (a rarer medium). During this propagation, they bend away from the normal on refraction.
(2) As a result, the immersed part of the pencil does not appear straight with respect to the part outside the water, but appears to be raised. Hence, a pencil dipped obliquely in water appears bent at the surface of the water.
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Knowledge Check

  • Consider the following statements and select the correct code. Assertion (A): A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent at the surface of water. Reason (R): The light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true, but R is not the correct explanation of A.
    C
    A is true, but R is false.
    D
    A is false, but R is true

  • Assertion (A) : A stick is dipped in water in a starting position . If observed side ways, the stick appears short and bent at the surface of water Reason (R) : A light coming from the stick under goes scattering from water molecules giving the stick as hart and bent appearance

    A
    both A and R and true and R is the correct explanation of A
    B
    both A and R are true but R is not a correct explanation of A
    C
    A is true but R is false
    D
    A is false but R is true

  • A pencil partially immersed in water appears to be displace at the interface of air water , this is due to

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    Tyndal effect
    B
    scattering
    C
    dispersion
    D
    refraction

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