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Light Test - 25

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Light Test - 25
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Weekly Quiz Competition
  • Question 1
    1 / -0
    A candle is placed in front of an optical instrument, and an image is obtained as erect, virtual, and reversed from left to right. Identify the device that would produce the types of images described above.
    Solution
    The image formed by a concave mirror can be real or virtual and inverted as well.
    The image formed by the convex mirror will be virtual, erect but smaller in size than the object.
    The image formed by a convex lens can be inverted.
    Plane mirrors are the only mirrors for which the image will always be virtual, erect, and of the same size as the object. The image produced is also laterally inverted.
  • Question 2
    1 / -0
    Distance between an object and plane mirror is 100cm. Find the distance between the object and its image.
    Solution
    For plane mirror, the distance between object and mirror $$=$$ distance between image and mirror $$=100$$ (given)
    Thus, distance between the object and image $$=100+100=200 cm$$ 
  • Question 3
    1 / -0
    Mirrors on the outside of the passenger side of the cars often contain a message that says something like. "Objects are closer than they appear." In the other words, the images seen in the mirror, although looking like the objects in other respects, appear to be further away than they actually are, because the images are the smaller than the objects.
    What kind of mirror is being used in this case? 
    Solution
    From given passenger statements image distance is grater then object distance from mirror ie $$v>u$$. and also size of image is smaller then object.
    Now,
    In plane mirror; Image distance should be equal to object distance and magnification $$M=1$$
    For curve mirror,
     When $$v>u$$ its mean that object should be between pole and optical center. in such case concave mirror always formed Magnified and inverted image. whereas Concave mirror formed diminished and erect image.
    Hence Given mirror will be Convex mirror. 
    So option B.
  • Question 4
    1 / -0
    Where should the object be placed to get the virtual image in case of convex lens?
    Solution

    Correct answer is (b).

    When the object is located at a location in front of the focal point, i.e. between F and O, then virtual image is formed by convex lens and the image is located behind the object and is enlarged; in other words, the image dimensions are greater than the object dimensions.

  • Question 5
    1 / -0
    Where should the object be placed if we use convex lens to obtain real, inverted and diminished image?
    Solution
    Correct answer (c)

    Object should be placed at infinity to obtain real, inverted and diminished image in case of convex lens. A real image is an image formed by actual rays of light. these images are always inverted, and they may be either larger or smaller than the object. 

  • Question 6
    1 / -0
    An object O is placed in front of a mirror. Which is possible position of the image?

    Solution
    It is to be remembered that plane mirror forms an image at the same distance as that object perpendicular to the mirror.
  • Question 7
    1 / -0
    The words UNIFIED are flashed infront of mirror. Which set of alphabets on laterally inversion seem to appear differently?
  • Question 8
    1 / -0
    Which objects use the reflection of light?
    Solution
    The side mirror of a car is a convex mirror that uses the reflection of light.
    Periscope uses two plane mirrors for image formation.
    All mirrors use reflection of light to form images.
  • Question 9
    1 / -0
    Two mirrors(facing each other) and an object O are placed in the grid as shown. At which positions(s) can the virtual image of object O be formed?

  • Question 10
    1 / -0
    For a concave mirror, whenever the distance of the object is less than the focal length, the image is virtual. That is called virtual image, because
    Solution
    A real image can be caught on a screen whereas a virtual image cannot be caught on a screen.
    A real image is formed when the rays of light after reflection or refraction actually meet at some point whereas a virtual image is formed when the rays of light after reflection or refraction appear to meet at a point.
    Hence virtual images cannot be caught on screen.
    Hence Option C.
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