If the magnification of a virtual image formed by an object 10cm from a convex less is 3; then the focal length of the lens is?

A manometer is an instrument used for measuring?

A. Relative density of liquid B. Pressure in liquids and gases C. Humidity D. Atmospheric pressure Correct Answer: Option B – Pressure in liquids and gases Explanation a manometer is used to measure pressure in liquids and gases. Manometer gauges measure the...

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