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Light Test - 21

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Light Test - 21
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  • Question 1
    1 / -0
    The nature of the image formed by a plane mirror is :
    Solution

    $$\textbf{Explanation:}$$

    $$\bullet$$ From the mirror formula $$\dfrac{1}{u}+\dfrac{1}{v}=\dfrac{1}{f}$$; for a plane mirror R = $$\infty $$, hence f = $$\infty $$. Therefore, $$\dfrac{1}{f}=0$$

    $$\bullet$$ The formula becomes $$\dfrac{1}{u}+\dfrac{1}{v}=0\text{ or }\dfrac{1}{u}=-\dfrac{1}{v}\text{ or -}u=v$$

    $$\bullet$$Thus, the image formed by a plane mirror is always virtual, inverted laterally, and erect. 

    $$\bullet$$It has a characteristic magnification of unity ($$\because \dfrac{v}{u}=1$$); hence the image is of the same size as that of the object. 

    $$\textit{Answer:}$$

    $$\textbf{Hence, the correct option is (D) all of the above}$$

  • Question 2
    1 / -0
    A person looks into the mirror by placing it close to his face. The image of his face was erect, laterally inverted and of the same size. Then, the mirror must be :
    Solution
    The nature of the image formed by a plane mirror is virtual, erect, of the same size, and also laterally inverted. 
    The image given the question satisfies all these properties. Therefore, the mirror is a plane mirror.
  • Question 3
    1 / -0
    If image is formed behind the mirror, it is:
    Solution
    If the reflected rays are extended behind the mirror, then their intersection gives the location of the image behind the mirror. For a convex mirror, the image is diverging, virtual and upright and is formed behind the mirror. 
    Hence, if image is formed behind the mirror, it is virtual and erect.
  • Question 4
    1 / -0
    A person looks into the mirror by placing it close to his face. The image of his face was erect, laterally inverted and of the same size. Then, the mirror must be
    Solution
    Images formed by plane mirrors are always virtual,erect,and of unit magnification  and laterally inverted. Hence the given mirror must be a plane mirror.
  • Question 5
    1 / -0
    Find out the only wrong statement in the following:
    Solution
    Correct Option is B
    Explanation for the correct answer:
    $$\bullet$$ Speed of light in vacuum is $$3 \times 10^8 ms^{-1}$$ whereas speed of sound in dry air is $$343ms^{-1}$$. Thus, speed of light is greater than speed of sound. Option A is incorrect.
    $$\bullet$$ Light is an Electro-Magnetic Wave, it do not requires any medium for its propagation. That's why the light from Sun reaches to us on Earth. Thus, light can travel through vacuum. Option B is correct.
    $$\bullet$$ Wavelength of Light wave is very small which produces negligible diffraction in its path. Thus it travels in straight line. Option C is incorrect.
    $$\bullet$$ According to particle nature of light, light is made up of photons. And rest mass of the photon is zero. Thus light has no weight. Option D is incorrect.

    Thus, only Option B is correct.
  • Question 6
    1 / -0
    When rays of light fall on a convex lens, it
    Solution
    When rays of light fall on a convex lens, then the lens refracts(the incident ray undergoes refraction twice before leaving the convex lens) the incident light rays and merges the light rays at one point. The point where all the light rays meet is called its focus. It converges the light rays to a point. So It is also called a converging lens.

  • Question 7
    1 / -0
    The image of our face in a plane mirror is :
    Solution
    For a plane mirror the image formed is behind the mirror, so by definition its virtual
  • Question 8
    1 / -0
    Find the correct statements related to the image formed by the plane mirror from  the given statements below.
    Solution
    Properties of image formed by a plane mirror are
    (1) Virtual image.
    (2) Errect.
    (3) Laterally inverted.
    (4) Same size as object.
    (5) Equal in distance from the mirror as object.
  • Question 9
    1 / -0
    The path along which light travels in a homogenous medium is called the
    Solution
    Light rays are defined to propagate in a rectilinear path as they travel in a homogeneous medium. This path is known as ray of light..
  • Question 10
    1 / -0
    Change in the direction of light when it falls on an object is called :
    Solution
    When a light ray strikes a mirror or surface or any object then it gets sent back into the medium from which it came.This is called reflection of light.The direction of light changes by reflection.Hence correct answer is reflection.
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