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Ray Optics Test - 71

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Ray Optics Test - 71
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Weekly Quiz Competition
  • Question 1
    4 / -1
    A lens of power + 2 dioptres is placed in contact with a lens of power –1 diopotre. The combination willbehave like
    Solution

  • Question 2
    4 / -1
    A candle placed 25 cm from a lens, forms an image on a screen placed 75 cm on the other end of the lens. The focal length and type of the lens should be
    Solution

  • Question 3
    4 / -1
    We combined a convex lens of focal length f1 and concave lens of focal lengths f2 and their combined focal length was F. The combination of these lenses willbehave like a concave lens, if
    Solution

  • Question 4
    4 / -1
    A convex lens has a focal length f. It is cut into two parts along the dotted line as shown in the figure. Thefocal length of each part will be

    Solution

  • Question 5
    4 / -1
    An object has image thrice of its original size when kept at 8 cm and 16 cm from a convex lens. Focal length of the lens is
    Solution

  • Question 6
    4 / -1
    The combination of a convex lens (f = 18 cm) and athin concave lens (f = 9 cm) is
    Solution

  • Question 7
    4 / -1
    The plane faces of two identical piano-convex lenses each having focal length of 40 cm are pressed against each other to form a usual convex lens. The distance from this lens, at which an object must be placed to obtain a real, inverted image with magnification one is
    Solution

  • Question 8
    4 / -1
    The unit of focal power of a lens is
  • Question 9
    4 / -1
    A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 2/3. Their equivalent focal length is 30 cm. What are theirindividual focal lengths
    Solution

  • Question 10
    4 / -1
    If two + 5 D lenses are mounted at some distance apart, the equivalent power will always be negative ifthe distance is
    Solution

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