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a beam of light converges to a point on a screen S .A mirror is placed infront of the screen at a distance of 10 cm from the scree

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a beam of light converges to a point on a screen S .A mirror is placed infront of the screen at a distance of 10 cm from the screen.the beam now converges at a point 20 cm infront of the mirror.find focal length of the mirror​

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Harper

3) 60,230,000,000,000,000 molecules are contained in a drop of w
8.Draw a line P draw a nernendicular to​


Which of the following imperative sentences expresses warning?
A. Respect your elders
B. Have mercy on us
D.

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