An optician while testing the eye of patient keeps a chart 3m behind the patient and ask him to see the letter on image of chart on plane mirror kept 2m in front of him.how far is the chart away from him

 

 

NOTE: Your question says "How far is the chart from the patient?" It is already given in the question that chart is at a distance of 3 m.

So, actually the question should have been "How far is the image of the chart?" We have answered accordingly.