Define power of a lens. What is its unit? One student uses a lens of focal length 50 cm and
another of -50 cm. What is the nature of the lens and its power
used by each of them?
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Answers
Answer:
If a lens has a shorter focal length it is said to be more powerful. The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D
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Therefore the lens with focal length -50 cm is concave lens. The image which is formed by the concave lens is virtual, erect and diminished irrespective of the "position of the object
Power of lens is known as the inverse of the focal length of the lens measured in meter(m). Power of lense = 1/ focal length in meter. The lense used is a convex lens because the focal length is a positive value. The lense used is a concave lens because the focal length is a negative value.
power of a lense is it's capacity to converge or diverge the light rays falling on it.
unit - P (dioptre) = 1/f (in m)