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Q.

A convex lens has a focal length of 10 cm. the location and nature of the image if a point object is placed on the principal axis at a distance of 9.8 cm is

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a

510 cm on the side of the object, virtual

b

510 cm on the side of the object, real

c

490 cm on the side of the object, virtual

d

490 cm on the side of the object, real

answer is C.

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Detailed Solution

f=10cm,u=9.8cm

v=+ve,u=−ve

We know

1f=1v−1u⇒110=1v+19.8

1v=110−19.8=9.8−1098

1v=−0.298⇒v=−9802

v=−490

v=−ve, so image virtual and same side of the object 

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