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  4. An object is placed 1 m in front of a plane mirror. An observer stands 3 m behind the object. For what distance must an observer focus his eyes in order to see the image of the object?

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Q. An object is placed $1 m$ in front of a plane mirror. An observer stands $3 m$ behind the object. For what distance must an observer focus his eyes in order to see the image of the object?

Ray Optics and Optical Instruments

Solution:

The ray diagram for the situation is as shown below
image
Required distance $= 5m$.