Question

A concave lens of focal length 25 cm produces an image at 20cm from the lens.What is the nature of the image...?
Find the position of the object....

Genuine answers only.....
​

Answer 1

For the combinationof lens,

Here, u = -40 cm , v = +80cm , f = ?

∴

f

1

=

80

1

−

−40

1

f=

3

80

Now,

f

1

=

f

1

1

+

f

2

1

⇒

f

2

1

=

f

1

−

f

1

1

f

2

1

=

80

3

−

25

1

=

400

15−16

=

400

−1

⇒f

2

=−400cm

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Answer 2

Answer:

nature-virtual

position -5cm

Explanation:

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