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प्रश्न
State power of a lens S.I. unit.
उत्तर
The S.I. unit of power is diopter (D).
संबंधित प्रश्न
How unit of power related to focal length of a lens?
What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.
The lens A has a focal length of 25 cm whereas another lens B has a focal length of 60 cm. Giving reason state, which lens has more power: A or B.
Name the physical quantity whose unit is dioptre.
A diverging lens has focal length of 3 cm. Calculate the power.
On reducing the focal length of a lens, its power ______.
A thin converging lens is formed with one surface convex and the other plane. Does the position of image depend on whether the convex surface or the plane surface faces the object?
A symmetric double convex lens in cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4 D, the power a cut-lens will be
The power of a lens is +2.0 D. Find its focal length and state the kind of lens.
Increase in the converging power of eye lens cause ‘hypermetropia'
