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Light Test - 20

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Light Test - 20
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Weekly Quiz Competition
  • Question 1
    1 / -0
    What type of mirror in the inward and outward shining surface of a steel spoon is ?
    Solution
    We are able to see our image due to reflection taking place from the shining surface which acts as a mirror. The outward curved shining surface acts as a convex mirror and the inward shining surface acts as a concave mirror.

  • Question 2
    1 / -0
    When you look at yourself in a plane mirror, you see a 
    Solution

  • Question 3
    1 / -0
    How many letters of the word 'EXAMINATION' remain unchanged when the word is seen after reflection
    Solution
    The letters which have a vertical axis of symmetry will remain unchanged under lateral inversion. Therefore, the letters X, A, M, I, T, and O are the 8 letters(A and I repeating twice) in total that won't be changed after reflection from a plane mirror.
  • Question 4
    1 / -0
    Which of the following letters will be seen without any change in a plane mirror?
    Solution

    A plane mirror causes lateral inversion, so the letters S, L, and P will be laterally inverted. T is a laterally symmetrical object and hence its image in a plane mirror would be the same as itself.

  • Question 5
    1 / -0
    What type of mirror is this?

    Solution
    $$\large \textbf{Concept used:}$$
    Identifying a given mirror.

    $$\large \textbf{Correct option: A}$$

    $$\large \textbf{Explanation for correct option:}$$
    Here we can directly see that the reflecting surface is curved inwards, that is, facing towards the centre of the sphere. So it is a $$concave \ mirror$$.
    In a Concave Mirror:
    $$\bullet$$ The centre of curvature lies in front of the reflecting surface.
    $$\bullet$$ A number of rays parallel to the principal axis when falls on the mirror, the reflected rays ACTUALLY meet/intersect at a point on the principal axis of the mirror. 
    $$\bullet$$ So a real point-sized image is forming at the focus.

  • Question 6
    1 / -0
    The letter of the English alphabet in front of the plane mirror that does not show lateral inversion is__
    Solution
    When object is placed before a plane mirror, the left part of the object appears to be right part of the image and vice versa. This is called lateral inversion.The letters which do not show lateral inversion are
    A,H,I, M, 0,T,U,V, W,X,Y.Because their left and right part are identical so they  remain same even after lateral inversion .So it appears that no lateral inversion has happened to these letters.
  • Question 7
    1 / -0
    It was the British scientist _______who discovered in 1666 that light consists of seven colours. Fill in the blank.
    Solution

    Correct answer is (a) Sir Issac Newton.

    In 1666, during one of his optical experiments, Newton passed a beam of sunlight through a glass prism. The glass prism split the light into a band of seven colours on his wall. This phenomena is known as dispersion of light

    He called this band of colours the ‘spectrum’. Thus the spectrum is a band of seven colours which is obtained by splitting of white light by a glass prism.

  • Question 8
    1 / -0
    A concave mirror cannot be used as a:
    Solution
    For objects  beyond focal point, a concave mirror creates real and enlarged images in front of the mirror. So, it is not advantageous to use a concave mirror as a rear view mirror. Because it will cover very small area behind the car.
    Convex mirrors create diminished virtual images behind the mirror. So, it is advantageous to use convex mirrors as rear view mirrors. Because they can cover a large view area of behind.
  • Question 9
    1 / -0
    The experiment given shows that light :

    Solution
    Answer is C.

    In a dusty atmosphere it is sometimes possible to see light travelling and it does appear to be moving in a straight line. The fact that light travels can be demonstrated by putting an object in its path. If the object is opaque the result is a degree of blackness on the other side of it which is due to the absence of the light. 
    Two experiments are used to demonstrate how light travels in straight lines. In the first example, the experimenter arranges three pieces of card, with holes in, in an uneven line. The light stops and cannot travel through all three cards. When experimenter arranges the holes in a straight line, the light can travel through. In the second example, a light source is shone onto a shiny and uneven surface. We see how the light still travels in a straight line, but scatters and reflects in different directions.
    Hence, Light travels in a straight line.
  • Question 10
    1 / -0
    Which of the following letters will be seen with some change in a plane mirror?
    Solution
    Reflection through a plane mirror causes lateral inversion to the image.
    The letters, M, T and W are laterally symmetric. So, no change will be observed after these letters are reflected on a plane mirror. The letter, L is not laterally symmetric. So, it will undergo lateral inversion and the image will appear different from the object.
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