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An object is placed 10 cm from a diverging lens which forms an image 6.5 cm from the lens. What is the focal length of the lens?

An object is placed 10 cm from a diverging lens which forms an image 6.5 cm from the lens. What is the focal length of the lens?

### Asked by RAHUL rd | 22nd Nov, 2014, 10:33: PM

Expert Answer:

### Given that:
The object distance,u = -10cm
The image distance ,v= -6.5 cm
Let f be the focal length of the lens.
According to lens formula we know that:

Given that it is a diverging lens ,i.e. concave lens.The focal length of a concave lens is - ve.
So the focal length of the lens =-18.6 cm

### Answered by Jyothi Nair | 22nd Nov, 2014, 11:59: PM

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