(f) By how much is the pencil longer than the eraser? 10 CM Given that the boy in this picture is 130 cm tall, estimate the height of his sisters. Height of his elder sister = about 200 cm about 115 cm about 145 cm about 135 cm Height of his younger sister = about 115 cm about 130 cm
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Minimum length of plane mirror required in such cases doesn't depend on distance of object from the mirror and is always equal to half of height of object.
∴ length of mirror=
2
180
=90cm
Hope it helps ❤️
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