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6) An object is placed perpen-licular to the principle axis of aconvex lens of focal length 10 cm, Thedistance of the object from the o cicalof the lens is 15 cm. Calculatethe position of the image formed.Mention the nature of the imagecentre

Answer»

f== 20cm

u = -30cm

v = ?

using the lens formula : 1/f = 1/v - 1/u

1/20 = 1/v - 1/-30

1/v = 1/20 - 1/30

1/v = (30 - 20)/600

1/v = 10/600

v = 60cm

therefore the image is formed at 60cm from the lens.

Magnification = v/u

= 60/-30

= -2 D

hence, the image formed is real and inverted.



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