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An object is moved towards a convex lens to a certain distance so that the magnification of the image changes from -2 to +2. If the focal length of the lens is 30 cm, then find the distance through which the object is moved towards the lens.

Asked by सुधाकर 3rd March 2017, 5:56 PM

Hi Rimjhim,

We prefer to answer such 'in depth' queries on the platform wherein all the queries are solved elaborately.

Therefore, please post this query in 'Ask the Expert' section on our website www.topperlearning.com

Thank You!

Answered by Expert 3rd March 2017, 6:29 PM

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The rain water from a roof 22 m × 20 m drains into a conical vessel having a base of diameter 2 m and height 3.5 cm. If the vessel is just full, find the rainfall in mm.

Asked by shailesh.solanki 18th March 2018, 7:37 PM

The rain water from a roof 22 m × 20 m drains into a conical vessel having a base of diameter 2 m and height 3.5 cm. If the vessel is just full, find the rainfall in mm.

Asked by shailesh.solanki 18th March 2018, 7:35 PM

A wooden toy was made by scooping out a hemisphere of same radius from each end of a solid cylinder. If the height of the cylinder is 10 cm, and its base is of radius 3.5 cm, find the volume of wood in the toy. Use pie=22/7

Asked by shailesh.solanki 18th March 2018, 7:34 PM