what is the power of a len?State the SI unit of a len and how the power of a len is connected to focal length?
Answers
Answer:
Power of a lens is defined as the inverse of focal length (in meters) of the lens. It is a measure of the amount of deviation of light ray produced by a lens, more the power, more is the deviation.
The power of a lens is defined as the reciprocal of its focal length. It is represented by P. The SI unit of power is dioptre. The power of a convex lens is positive, the power of a concave lens is negative as a concave lens has a negative focal length.
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GIven:
what is the power of a lens? State the SI unit of a lens and how the power of a lens is connected to focal length?
To Find:
what is the power of a lens? State the SI unit of a lens and how the power of a lens is connected to focal length?
Solution:
The power of a lens in Ray Optics is its ability to bend light. The greater the power of a lens, the greater is its ability to refract light that passes through it. For a convex lens, the converging ability is defined by power, and in a concave lens, the diverging ability.
Its SI unit is Dioptre which is shown by capital D.
The reciprocal of the focal length is defined as the power of a lens.