A man is 180,cm tall and his eyes are 10,cm b | vedclass

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(B) To see the full image of an object of height $H$ in a plane mirror,the minimum length of the mirror required is $H/2$,regardless of the distance o

Vedclass · Accepted Answer

$90$

Vedclass · Answer

(B) To see the full image of an object of height $H$ in a plane mirror,the minimum length of the mirror required is $H/2$,regardless of the distance of the mirror from the observer.Here,the height of the man is $H = 180\,cm$.Therefore,the minimum length of the mirror required is $L = H/2 = 180/2 = 90\,cm$.The position of the eyes does not affect the minimum length of the mirror required to see the full image,as the rays from the top of the head and the toes must reach the eyes after reflection. The mirror must cover the vertical range from the midpoint between the eyes and the top of the head to the midpoint between the eyes and the toes.

$A$ man is $180\,cm$ tall and his eyes are $10\,cm$ below the top of his head. In order to see his entire height from toe to head,he uses a plane mirror kept at a distance of $1\,m$ from him. The minimum length of the plane mirror required is.....$cm$.

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