Question

Find the size of object if the image distance is 10m,object distance is 800m and size of image is 1m​

Answer 1

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• Image distance (v) = 10 m
• Object distance (u) = 800 m
• Size of the image (h') = 1 m
• Size of the object (h) = ?

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• Find the size of the object ?

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• Magnification (m) = $\bold{\frac{Image\:height\:(h')}{Object\:height\:(h)}}$                

                        (or)

• Magnification (m) = $\bold{\frac{-\: Image\:distance\:(-v)}{Object\:distance\:(u)}}$

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• Magnification (m) = $\bold{\frac{-\: Image\:distance\:(-v)}{Object\:distance\:(u)}}$

• Magnification (m) = $\bold{\frac{-\: 10}{800}}$

• Magnification (m) = $\bold{\frac{-\: 1}{80}}$

• Magnification (m) = $\bold{\frac{Image\:height\:(h')}{Object\:height\:(h)}}$

• $\bold{\frac{-\: 1}{80}} \:=\:\bold{\frac{1}{Object\:height\:(h)}}$

• Object height (h) = $\bold{\frac{80}{-1}}$

∴ Object height = - 80 m

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