Question
A point object is placed at a distance of 10 cm and its real image is formed at a distance of 20 cm from a concave mirror. If the object is moved by 0.1 cm towards the mirror, the image will shift by about
Answer: Option A
:
A
Mirror formula
1f=1v+1u⇒1f=1−20+1(−10)⇒f=203cm.
If object moves towards the mirror by 0.1 cm then. u =(10-0.1)=9.9 cm.
Hence again from mirror formula 1−203=1v+1−9.9⇒v′=20.4cm
i.e. image shifts away from the mirror by 0.4 cm.
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:
A
Mirror formula
1f=1v+1u⇒1f=1−20+1(−10)⇒f=203cm.
If object moves towards the mirror by 0.1 cm then. u =(10-0.1)=9.9 cm.
Hence again from mirror formula 1−203=1v+1−9.9⇒v′=20.4cm
i.e. image shifts away from the mirror by 0.4 cm.
Was this answer helpful ?
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