Focal Length experiment readings

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To determine the focal length of a concave lens combined with a convex lens, the focal lengths provided are 15 cm for the convex lens and -30 cm for the concave lens. The formula for the effective focal length (F) of two lenses in contact is given by 1/F = 1/f1 + 1/f2. By substituting the values, the effective focal length can be calculated. The slope of the straight line plotted on graph paper from the readings will indicate the focal length of the concave lens. Understanding how to calculate the focal length of a compound lens is essential for accurate results.
bishshoy007
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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.
 
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Don't you know how to calculate the focal length of a compound lens?

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