Focal Length experiment readings

[bishshoy007]

Hello, I need help with the lens experiment, the aim of which is to determine the focal length of a concave lens by combining it coaxially with a convex lens.

Given the focal length of the CONVEX lens is 15cm.
and the focal length of the CONCAVE lens is 30cm.

Can you give me a set of reading, plotting which on the graph paper the slope of the st. line shall give the CONCAVE lens' focal length.

Thanks in advance.

 

[ZapperZ]

Don't you know how to calculate the focal length of a compound lens?

Zz.

 

[sir-pinski]

Sure, I would be happy to help with the focal length experiment readings. Based on the information provided, the aim of the experiment is to determine the focal length of a concave lens by combining it with a convex lens. The focal length of the convex lens is given as 15cm, and the focal length of the concave lens is given as 30cm.

To determine the focal length of the concave lens, you will need to set up the two lenses coaxially, with the convex lens closer to the object being observed. You will then need to move the lenses back and forth until a clear image is formed on a screen or piece of paper placed at the focal point.

To obtain a set of readings, you can measure the distance between the two lenses when a clear image is formed. Start with a larger distance and gradually decrease it until a clear image is achieved. Record the distance between the lenses each time a clear image is formed.

Once you have a set of readings, you can plot them on a graph with the distance between the lenses (x-axis) and the focal length (y-axis). The slope of the straight line on the graph will give you the focal length of the concave lens. The equation for the slope is slope = change in y / change in x.

I hope this helps with your experiment. Let me know if you have any further questions. Good luck!