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प्रश्न
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उत्तर
1 nm = 10 Å
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संबंधित प्रश्न
Define power of a lens. Write its units. Deduce the relation `1/f =1/f_1 +1/f_2`for two thin lenses kept in contact coaxially.
A convex lens produces a double size real image when an object is placed at a distance of 18 cm from it. Where should the object be placed to produce a triple size real image?
A lens forms an upright and diminished image of an object, irrespective of its position. What kind of lens is this? Draw an outline ray diagram to show the formation of the image. State the position and one more characteristic of the image.
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?
The lens of power + 1·0 D is ______.
In what unit is the power of a lens expressed?
The power of a lens is defined as the:
When a lens is placed in a liquid, the total power of the lens is:
If the refractive index of the lens material is less than that of the surrounding liquid (\[n_2 < n_1\]), then:
A convex lens has:
