Question

e) An objet
is placed at a distance 10 cm from optical centre of a convex lens of focal length 1.5cm. Draw a labelled ray diagram to show that formation of image in this case.

Answer 1

Explanation:

Object Distance(u) = 10 cm. (negative)

Focal length of the lens (f) = 5 cm.

We know, convex mirror always forms the virtual, upright and diminished.Also, Object distance in the convex mirror is always negative where as Image distance and focal length are positive.

Now, Applying the Mirror's Formula,

f

1

=

v

1

+

u

1

=

5

1

=

v

1

+

1

=

5

1

=

10v

(10−v)

10v=50−5v

15v=50

v=

3

10

so the image distance (v) =3.33cm.

I hope this will help you.

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