JIPMER 2019 Evening Papers Online Practice

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Refraction from Ist lens.
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1

V

−

1

U

=

1

f

1

V

=

1

f

+

1

U

1

V

=

1

10

−

1

40

V=

40

3

‌cm
V is object for IInd lens
U = 30 -

40

3

=

50

3

cm
Refraction from IInd lens.

1

V

−

1

U

=

1

f

1

V

+

3

50

=

1

10

1

V

=

1

10

−

3

50

1

V

=

2

50

V = 25 cm
This V is object for IIIrd lens.
U = 30 – 25 = 5 cm

1

V

=

1

f

+

1

U

⇒

1

V

=

1

10

−

1

5

⇒

1

V

=

−1

10

V = – 10 cm
This is location of final image.
Distance from Ist lens is = 20 + 30 = 50 cm