1
The unit of focal length is:
2
Acoustic lenses are used to focus:
3
The phenomenon of bending of light when it passes from one medium to another is called:
4
The refractive index of a medium depends upon:
5
Which mirror is used as a rear-view mirror in vehicles?
6
A convex lens is also known as:
7
The focal length of a concave lens is taken as:
8
The splitting of white light into its component colors is called:
9
Which instrument uses lenses to view very small objects?
10
The visible spectrum lies between:
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