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 aboutA. 0.4 cm away from the mirrorB. 0.8 cm away from the mirrorC. 0.4 cm towards the mirrorD. 0.8 cm towards the mirror

A point object is placed at a distance of 10 cm and its real image is

1.	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 aboutA. 0.4 cm away from the mirrorB. 0.8 cm away from the mirrorC. 0.4 cm towards the mirrorD. 0.8 cm towards the mirror
Answer» Correct Answer - A From the relation, `(1)/(v)+(1)/(u)=(1)/(f)` We have, `(-dv)/(v^(2))-(du)/(u^(2))=0` `therefore " " dv=(v^(2))/(u^(2))(-du)=((20)/(10))^(2) (0.1)=0.4 cm " "` (away from the mirror)

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