Q.1
A concave lens is in contact with a convex lens. The magnitude of the ratio of their focal lengths is 2/Their equivalent focal length isπ‘π‘š. What are their individual focal lengths respectively?
  • βˆ’75,50
  • -10, 15
  • 75,50
  • βˆ’15,10
Q.2
Light produced by an object due to being a very high temperature is called
  • fluorescent
  • electric discharge
  • incandescent
  • triboluminescence
Q.3
The larger the index of refraction the ...
  • larger the critical angle
  • smaller the critical angle
  • no change to the critical angle
  • what?!
Q.4
A concave lens forms the image of an object such that the distance between the object and image iscm and the magnification produced is 1/The focal length of the lens will be : __________
  • 8.6 cm
  • 6.2 cm
  • 10 cm
  • 4.4 cm
Q.5
A real image is formed in plane mirror.
  • True
  • False
Q.6
If frequency increases, wavelength ____
  • increases
  • decreases
  • stays the same
Q.7
A magnifying glass is an example of what type of lens?
  • convex
  • concave
  • mirror
  • Cylinder
Q.8
Images seen in a plane mirror are always
  • Upright and Virtual
  • Upright and Real
  • Inverted and Virtual
  • Farther and Virtual
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