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The power of lens is -2.5 D. identify the lens and find ‘f’. |
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Answer» Here, P = -2.5 D f (in metres) = \(\frac{1}{P}\) = \(\frac{1}{−2.5}\) = 0.4 m = -40 cm Negative sign represents concave lens. Given ,Power of lens = -2.5 D We know that , D = 1 / f Therefore , f = 1 / D = 1 / -2.5 = - 0.4 m = - 40 cm The mirror is a concave lens as the focal length is negative . |
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