Question

the radius of curvature of the bi convex lens is 6cm. draw the ray diagrams of an object placed on principal axis of 6cm and 3cm distance from the optic centre to the lens.
plz answer it fast
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Answer 1

Answer:

Correct option is

B

30

Given,

for lens 1,

Image distance, v=60cm

let object distance be u

f

1

1

=

v

1

−

u

1

f

1

1

=

60

1

+

u

1

f

1

1

=

60u

u+60

....(1)

when the lenses are combined, the image distance =v

2

=60−40=20cm

Focal length of the combination be F

F

1

=

f

1

1

+

f

2

1

=

v

2

1

−

u

1

⇒

f

1

1

+

f

2

1

=

20

1

+

u

1

⇒

60u

u+60

+

f

2

1

=

20

1

+

u

1

⇒

f

2

1

=

20u

u+20

−

60u

u+60

f

2

1

=

1200u

2

60u

2

+1200u−20u

2

−1200u

=

1200u

2

40u

2

Explanation:

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