Focal length and power of the suitable corrective lens
The near point of an eye of person is around 60.0 cm. To view objects clearly at a distance of 25.0 cm, what must be the focal length and power of the suitable corrective lens? (Avoid the distance from the lens to the eye.)
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The dust particles are attracted towards the planet and some of them would ultimately fall onto its surface. Determine the resultant retarding force on the planet due to the dust cloud.
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