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  4. A small object is placed 10 cm in front of a plane mirror. If you stand behind the object 30 cm from the mirror and look at its image, the distance focused for your eye will be

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Q. A small object is placed $10 \,cm$ in front of a plane mirror. If you stand behind the object $30 \,cm$ from the mirror and look at its image, the distance focused for your eye will be

Ray Optics and Optical Instruments

Solution:

See following ray diagram
image
The distance focussed for eye $=30+10=40 \,cm$