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प्रश्न
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उत्तर
1 nm = 10 Å
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संबंधित प्रश्न
Define the power of a lens.
A student uses a lens of focal length 40 cm and another of –20 cm. Write the nature and power of each lens
Which one of the following materials cannot be used to make a lens?
Name the physical quantity whose unit is dioptre.
The focal length of a convex lens is 25 cm. What is its power?
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?
The power of a combination of two lenses X and Y is 5 D. If the focal length of lens X be 15 cm :
(a) calculate the focal length of lens Y.
(b) state the nature of lens Y.
How is the sign (+ or -) of power of a lens related to its divergent or convergent action?
If there is a convex lens of focal length 75 cm and a concave lens of focal length 40 cm, then calculate their combined power and combined focal length.
The focal length of a double convex lens is equal to the radius of curvature of either surface. What is the refractive index of its material?
