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Use the thin lense equation. 1/f = 1/d + 1/o, where f is the focal length, d is the image distance, and o is the object distance.

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Q: If the image distance from a len is 5cm and the object distance is 7.5 cm what is the focal length of the lens?
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Related questions

What is the relationship between object distance image distance and focal length of concave mirror?

Sum of reciprocal of object distance and reciprocal of image distance gives the reciprocal of focal length


What is the relationship between object distance image distance and focal length of a concave mirror?

Sum of reciprocal of object distance and reciprocal of image distance gives the reciprocal of focal length


Focal length of a concave mirror?

1/object distance + 1/ image distance = 1/focal length


What is the limit of the object distance to produce a real image?

Focal Length


Why do images in a concave mirror appear inverted?

If an object's distance from the concave mirror is greater than the mirror's focal length, then the mirror image of it will be inverted. If the distance from the concave mirror is less than the focal length of the mirror, the image will not be inverted. No image will be produced if the distance from the mirror to the object is equal to the mirror's focal length.


What happens to the image distance as the object distance increases?

the focal length of the eye lens is adjusted so that the image distance does not change.


How can you tell what the focal length is for a lens?

Easy way: Use it to form an image of the sun or moon, and measure the distance of the image behind the lens. When the object is at infinity, the distance between the lens and the image is the focal length of the lens.


How to calculate x of a lens knowing only the focal length which is the distance from the lens to the image of sun formed by it correct me if I'm wrong?

1/(focal length) = 1/(distance of object) + 1/(distance of image) is the formula for calculating x of a lens knowing only the focal length which is the distance from the lens to the image of sun formed by it.


Where does a simple positive lens form an image of a very distant object?

The image is formed behind the lens at a distance equal to the focal length. If the distance to the object is D1 and the focal length is F, then the distance D2 to the image is given by this equation: 1/D2 = 1/F - 1/D1


How do you find how far an image is formed from the lens if you have the distance from the lens to the object and the focal length how do you solve for distance from image that is formed?

Here's the equation you want. It's called the "Lensmaker's Formula".1/i + 1/o = 1/fi = image distance from the lenso = object distance from the lensf = focal length of the lens


When does a Convex lens form a virtual or real image?

When object is within the focal distance then virtual image is formed. But when the object is placed beyond the focus of the covex lens ie if the distance of the object is more than focal length then real image is formed.


When does a convex lens forms a real or virtual image?

When object is within the focal distance then virtual image is formed. But when the object is placed beyond the focus of the covex lens ie if the distance of the object is more than focal length then real image is formed.