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प्रश्न
Fill in the following blank with suitable words :
The reciprocal of the focal length in metres gives you the _________ of the lens, which is measured in ___________.
उत्तर
The reciprocal of the focal length in metres gives you the power of the lens, which is measured in dioptres.
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संबंधित प्रश्न
Calculate the focal length of a corrective lens having power +2.5 D.
What is the nature of a lens having a power of + 0.5 D?
The focal length of a lens is +150 mm. What kind of lens is it and what is its power?
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A normal eye is not able to see objects closer than 25 cm because
The power of a lens is +2.0 D. Find its focal length and state the kind of lens.
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?
A convex lens with radii of curvature R1 = R2 is immersed in water. Assuming that the refractive indices of glass and water are 3/2 and 4/3 respectively, its focal length f1 in comparison to that in air, f, is ______.
