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  • An object M is placed at a distance of a 3 m from a mirror with its lower end

Question 2 An object M is placed at a distance of a 3 m from a mirror with its lower end at 2 m from the ground as shown in the fig. 30.34. There is a person at a distance of 4 m from object. Find minimum and maximum height of person to see the image of object?

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@Shekhar suman

Find minimum and maximum height of person to see the image of object?

Answer:

 

\\so, tan\theta_1=\frac{h_{min}}{4+3+3}=\frac{OA}{OM'}\\\frac{h_{min}}{10}=\frac{2}{3}\\\\\Rightarrow h_{min}=\frac{20}{3}m\\\\and,\ tan\theta_2=\frac{h_{max}}{4+3+3}=\frac{OB}{OM'}\\\frac{h_{max}}{10}=\frac{2+2}{3}\\\\\Rightarrow h_{max}=\frac{40}{3}m\\

 

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sudhir kumar

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