Q. 185.0( 4 Votes )
What is the power of the lens?
The power lens is the degree of convergence or divergence of the light ray incident on any refracting surface of the lens.
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A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close contact with each other. Calculate the lens power of this combination.All In One Science
State and define the SI unit of power of a lens.All In One Science
Two lenses have power of (a) + 2D (b) – 4D. What is the nature and focal length of each lens?All In One Science
State the laws of refraction of light. Explain the term ‘absolute refractive index of a medium’ and write an expression to relate it with the speed of light in vacuum.
What is meant by power of a lens? Write its SI unit. A student uses a lens of focal length 40 cm and another of –20 cm. Write the nature and power of each lens.
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Two lenses of power -3.5 D and + 1 D are placed in contact. Find the total power of the combination of lens. Calculate the focal length of this combination.All In One Science