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Light Test - 26

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Light Test - 26
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Visually impaired and challenged persons can read and write using :
    Solution
    Braille system is specifically used by visually impaired and challenged person who doesn't have eyesight.
  • Question 2
    1 / -0
    Which of the below shows dispersion phenomena of light?
    Solution
    Prism disperses white light into spectrum.

  • Question 3
    1 / -0
    English Braille has how many levels of encoding?
    Solution
    Braille is a system of raised dots that can be read with the fingers by people who are blind or who have low vision.

    In English Braille there are three levels of encoding: Grade 1 – a letter-by-letter transcription used for basic literacy; Grade 2 – an addition of abbreviations and contractions; and Grade 3 – various non-standardized personal stenography.

  • Question 4
    1 / -0
    How frequently we should wear spectacles if it is advised by doctor if our eyes are damaged?
    Solution
    We should always wear spectacles if advised by doctors to protect our eyes from  further more damage.
  • Question 5
    1 / -0
    Braille system is traditionally written with:
    Solution
    Embossed paper is used for Braille system. These patterns when embossed on Braille sheets help visually challenged persons to recognise words by touching. To make them easier to touch, the dots are raised slightly
  • Question 6
    1 / -0
    Identify on which of the following, diffuse reflection would most likely to occur.
    Solution
    Diffuse reflection is the reflection of light from a surface such that an incident ray is reflected at many angles rather than at just one angle as in the case of specular reflection.
    The structure of the carpet's surface is as shown. Thus it shows a large amount of diffuse reflection.

  • Question 7
    1 / -0
    Identify on which of the following, specular reflection would most likely to occur. 
    Solution
    Specular reflection or regular reflection is a mirror-like reflection from any surface. The back of a mirror is usually covered with some sort of darkly colored, protective material to stop the silver coating from getting scratched, and also to reduce the risk of any light seeping through from behind. Silver reflects light better than almost anything else and that's because it gives off almost as many light as fall on it in the first place.
  • Question 8
    1 / -0
    Due to which phenomena the combination of red, green and blue forms the same white colour
    Solution
    The above question can be understood by Newton Disc experiment.
    The Newton disc, also known as the Disappearing Colour Disc, is a well-known physics experiment with a rotating disc with segments in different colors (usually Newton's primary colors: red, orange, yellow, green, blue, indigo, and violet or VIBGYOR) appearing as white (or off-white or gray) when it spins very fast.
    The reason of white color appearance on spinning is persistence of vision.
    Persistence of vision traditionally refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye.
    Due to this when a new color reaches our eyes previous color is still felt by our eyes and previous colors and succeeding colors combined together to form white color hence the rotating disc appears white because due to persistence of vision all colors are felt by our eyes at same time and combined together they appear white .
  • Question 9
    1 / -0
    Which of the following is the main reason of Opacity of light waves.
    Solution
    Objects are visible to the eye when light strikes the surface and reflect back itself into the eye. Opaque objects show this phenomenon.
    However, in the transparent objects, the incident light on their surface gets transmitted, hence does not reflect back to the eye and appear transparent.
  • Question 10
    1 / -0
    __________ is used in submarines to see objects above the water surfaces.
    Solution
    Periscope is used to see objects above the water surface in submarines. It is an optical instrument that used for observing over, around or through an obstacle or object which is prevented by direct line of sight by multiple reflections of light. 

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