The magnifying glass used by palm reader will represents the use of convex lens if the image formed by a lens of focal length 10cm, for an object placed at a distance of a) 15cm b) 8cm.
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"the object is placed at a distance of 15cm
u = -15cm (normal) f = 10cm v = ?
Lens formula: = -
= +
= + = = - v = 30 cm
Magnification = = = -2
If the object is placed at a distance of 8cm
u = -8cm (normal) f = 10cm v = ?
Lens formula: = -
= + ; = +
= + = = - =
v = -40 cm
The magnifying glass used by palm reader = object is at a distance of 8cm
"
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