How do you determine the image size formed by a convex lens?

  • Thread starter kriegera
  • Start date
In summary, the question is asking about the placement and size of an image formed by a candle placed 10 inches from a convex lens with a focal length of 5 inches. The formula used to find the image location is 1/f = 1/Do + 1/Di. For part B, the equation Si=So(Di/Do) is used but without the height of the object, a numerical answer cannot be given. It can only be stated that the image height is equal to the object height.
  • #1
kriegera
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Homework Statement


A candle is placed 10 inches from a convex lens whose focal length is 5 in. Where will the image be formed? How large an image is formed?



Homework Equations





The Attempt at a Solution


Here we use the following formula to find where the image will be formed:
1/f=1/Do+1/Di  1/Di=1/f-1/Do =
1/Di=1/5-1/10 = 2-1/10 = 10 in.


Here's the equation to solve part B but I don't know how to figure "So" which would be dimensions of the candle. Any help?

Si=So(Di/Do) =
Si=So(10/10) =
 
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  • #2
Well you can't give a numerical answer but you can say that the image formed is the same height as the object.
 
  • #3
AtticusFinch said:
Well you can't give a numerical answer but you can say that the image formed is the same height as the object.


So, there's no numerical way to solve without being given the height of the object?
 
  • #4
kriegera said:
So, there's no numerical way to solve without being given the height of the object?

Nope, because that would mean that the image height does not depend on the object height which is clearly not true.
 

What is the method for finding the size of a candle?

The most accurate method for finding the size of a candle is to measure its height, diameter, and weight. The height and diameter can be measured with a ruler or measuring tape, while the weight can be measured using a kitchen scale or a scale specifically designed for weighing candles.

Does the size of a candle affect its burn time?

Yes, the size of a candle can affect its burn time. Generally, larger candles will have a longer burn time than smaller candles. However, the type of wax, wick, and other factors can also impact the burn time of a candle.

How can I determine the burn time of a candle based on its size?

To determine the burn time of a candle based on its size, you can use a candle burn time calculator. These calculators take into account the size of the candle, type of wax, and other factors to estimate the burn time. You can also refer to the manufacturer's label or website for information on the estimated burn time of their candles.

Is there a standard size for candles?

No, there is no standard size for candles as they come in a variety of shapes and sizes. However, there are common sizes such as votive, pillar, tealight, and taper candles that are widely available. It is important to note that the size of a candle does not necessarily determine its quality or burn time.

Can I make my own candles and determine their size?

Yes, you can make your own candles and determine their size. You can purchase candle making supplies such as wax, wicks, and molds to create custom candles in various sizes. It is important to carefully follow instructions and safety precautions when making candles at home.

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