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Question
State power of a lens S.I. unit.
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Solution
The S.I. unit of power is diopter (D).
RELATED QUESTIONS
What does sign of power (+ve or –ve) indicate?
A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
A student uses a lens of focal length 40 cm and another of –20 cm. Write the nature and power of each lens
Name the physical quantity whose unit is dioptre.
A doctor has prescribed a corrective lens of power, −1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
An object of height 4.25 mm is placed at a distance of 10 cm from a convex lens of power +5D. Find (i) the focal length of the lens, and (ii) the size of the image.
What is the unit of power of a lens? Define the unit of power of a lens.
How is the sign (+ or -) of power of a lens related to its divergent or convergent action?
Consider the situation described in the previous problem. Where should a point source be placed on the principal axis so that the two images form at the same place?
If focal length of a convex lens is 20 cm at what is the power of the lens?
