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Light Test - 36

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Light Test - 36
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  • Question 1
    1 / -0
    Which of the following is a non-luminous body?
    Solution
    The non-luminous body is a body that does not emit light of its own. For example, earth whereas the sun, star, fire emits light and hence qualify as the luminous body.
  • Question 2
    1 / -0
    Which of the following is a non-luminous body?
    Solution
    The objects that can not emit light energy by themselves are known as Non- luminous object.
    Burning candle , The sun , Stars emit light of their own but earth does not have light of it's own so earth is a non-luminous object.
  • Question 3
    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 3×108ms13 \times 10^8 ms^{-1} whereas speed of sound in dry air is 343ms1343ms^{-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 4
    1 / -0
    Which of the following is a luminous body?
    Solution
    Luminous body: A body is said to be luminous if it emit light energy by itself. Exp: Sun, Torch, Bulb etc.
    A burning candle also produces light energy hence it is a Luminous body.
    Option A
  • Question 5
    1 / -0
    The path along which light travels in a homogeneous medium is called a :
    Solution
    The path along which light travels in a homogeneous medium is called a ray of light
  • Question 6
    1 / -0
    When the light is very bright,
    Solution
    Your eye can control how much light gets in. The coloured part of your eye, called the iris, controls the size of the pupil, the opening that lets light through. In dim light, the iris will cause your pupil to expand, allowing as much light as possible into your eye. In bright light, the iris causes the pupil to contract so that less light can enter to cause less damage to eye. 
  • Question 7
    1 / -0
    An object is kept between two plane mirrors inclined at an angle 120120 from each other; calculate the ratio of number of images which are formed if the object is not on the angle bisector to the number of images formed if object is on the bisector?
    Solution
    Given: An object is kept between two plane mirrors inclined at an angle 120 from each other
    To find the ratio of number of images which are formed if the object is not on the bisector and on the bisector
    Solution:
    If there are two plane mirrors inclined to each other at an angle θ\theta, the number of images of a point object formed are determined as follows:
    If (360θ)\left(\dfrac {360^\circ}\theta\right) is odd integer (say mm) number of images formed
    n=mn = m, if the object is not on the bisector of mirrors
    n=(m1)n = (m – 1), if the object is on the bisector of mirrors.
    So, when θ=120\theta=120^\circ, we get
    m=360120=3m=\dfrac {360}{120}=3
    So,
     number of images which are formed if the object is not on the bisector number of images which are formed if the object is on the bisector=331=32\dfrac {\text{ number of images which are formed if the object is not on the bisector}}{\text{ number of images which are formed if the object is on the bisector}}=\dfrac {3}{3-1}=\dfrac 32
  • Question 8
    1 / -0
    Objects which emit light of their own are called -
    Solution
    Objects which do not emit light on their own are called  nonluminous \bf{non-luminous} objects.

    Objects which allow the light to pass through them completely without any obstruction are called transparent \bf{transparent} objects.

    Objects which allow the light to pass through them partially are called translucent \bf{translucent} objects.

    Objects that give out or emit light of their own are called as luminous \bf{luminous} objects. 

    Hence, the correct answer is OPTION D. 
  • Question 9
    1 / -0
    A broader bundle of light rays is called a -
    Solution
    A single wave of light is called a ray.
    Bundle of light rays is called beam of light.
  • Question 10
    1 / -0
    The final image formed by a refracting periscope is ____ than the reflecting periscope.
    Solution
    Refracting periscope is far better in terms of image quality then reflecting periscope.Hence image formed by refracting periscope is brighter and sharper.
    The reason is refracting periscope use prism which shows total internal reflection (TIR) and TIR shows no loss of light. While reflecting periscope is based on simple reflection where some light energy is lost.
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