what is meant by power of lens.write its si unit.two lens off = +10and _10 cm.state the nature and power of lens. which of the two lens will form a virtual magnified image when the object is placed at 8cm from the lens?
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what type of lens..........
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the ability of the length to converge or diverge the Ray's of light is called power of lens .
it is also defined as the reciprocal of focal length (in mere ) of a lens.
P = 1/f
.it's si unit is dioptre ( D)
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