Computer Applications
An optician while testing the eyes of a patient keeps a chart of letters 3 m behind the patient and asks him to see the letters on the image of chart formed in a plane mirror kept at distance 2 m in front of him. At what distance is the chart seen by the patient?
Answer
Given,
Distance between the man and the mirror = 2 m
Distance between the man and the chart = 3 m
Therefore,
the distance between the chart and the mirror
= distance between the man and the mirror + distance between the man and the chart
= 3 m + 2 m
= 5 m
As the new image is formed on the mirror which is 2 m apart from the man,
So 5 m + 2 m = 7 m
Therefore,
the chart seen by the patient is 7 m away from him
Related Questions
An insect is sitting in front of a plane mirror at a distance 1 m from it.
(a) Where is the image of the insect formed?
(b) What is the distance between the insect and it's image?
An object is kept at 60 cm in front of a plane mirror. If the mirror is now moved 25 cm away from the object, how does the image shift from it's previous position ?
If in the question (1) given above the object is placed symmetrically between the mirrors, then the number of images formed will be :
- n
- n + 1
- n - 1
- 0