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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 isππ. What are their individual focal lengths respectively?
β75,50
-10, 15
75,50
β15,10
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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