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A 9.0 cm object is 3.0 cm from a lens, which has a focal length of –12.0 cm.

What is the distance of the image from the lens?
________cm

What is the height of the image?

________cm

What type of lens created this image?

_________

User Elston
by
5.3k points

2 Answers

5 votes

Answer:

A 9.0 cm object is 3.0 cm from a lens, which has a focal length of –12.0 cm.

What is the distance of the image from the lens?

-2.4 cm

What is the height of the image?

7.2 cm

What type of lens created this image?

concave

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see picture
its just concave
not concave lens ( I got it wrong when i added lens at the end )

Step-by-step explanation:

A 9.0 cm object is 3.0 cm from a lens, which has a focal length of –12.0 cm. What-example-1
User Tomoya Kabe
by
5.5k points
7 votes

Answer :

Image distance = -2.4 cm

Height of image = 7.2 cm

Concave lens

Explanation :

Given that,

Height of the object, h = 9 cm

Object distance, u = 3 cm

Focal length, f = -12 cm

Using mirror's formula


(1)/(f)=(1)/(u)+(1)/(v)


(1)/(v)=(1)/(f)-(1)/(u)


(1)/(v)=(1)/((-12))-(1)/((3))

v = -2.4 cm

Image distance is 2.4 cm from the lens.

Magnification,
m =(-v)/(u)=(h')/(h)


h'=(-vh)/(u)

h' = 7.2 cm

The height of the image is 7.2 cm. This shows that the image is upright.

The lens used is concave lens.

User Adam Warner
by
6.0k points