English, asked by kolathurbharath2004, 2 months ago

What is the apparatus shown in the figure? What is its use? blood pressure

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Answered by yourspratiksha

0

The apparatus shown in figure is used to find the focal length / focus of a lens as when the light source is kept far away, then we can shift the screen and place the screen where a point image is formed and that distance between screen and lens is focal length.

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