Physics
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.
Refraction Lens
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Answer
when we say focal length of a lens, we mean the first focal length of the lens.
Reason — When we refer to the focal length of a lens, it generally implies the magnitude of the focal length, regardless of whether it is the first or second focal length because focal length is the distance from the lens at which parallel rays of light converge or appear to converge after passing through the lens.
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Related Questions
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The radius of the sphere whose part is the lens surface is called the …………… of that surface.
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What is a lens?
Which lens is converging —
(i) an equiconcave lens or an equiconvex lens?
(ii) a concavo-convex lens or a convexo-concave lens?