Physics
What is a lens?
Refraction Lens
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Answer
A lens is a transparent refracting medium bounded by either two spherical surfaces or one surface spherical and another surface plane.
There are two types of lenses —
- Convex or converging lens
- Concave or diverging lens
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Related Questions
Identify the incorrect statement :
- if the medium on both sides of a lens is same, its first and second focal lengths are equal, i.e. f1 = f2 (numerically).
- when we say focal length of a lens, we mean the first focal length of the lens.
- a convex lens has a real focus.
- a concave lens has a virtual focus.
A convex lens of focal length f is divided into two equal parts by a plane parallel to the principal axis. The focal length of each part will be :
- 2f
- f/2
- f
- infinite
Which lens is converging —
(i) an equiconcave lens or an equiconvex lens?
(ii) a concavo-convex lens or a convexo-concave lens?
State the condition when a lens is called equiconvex or equi-concave.