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One option: Buy more dehumidifiers, and a space heater. Use the space heater to maintain the lab at the "elevated" temperature when the humidity is low and the dehumidifiers are not running. Another option: Run your dehumidifier when the humidity is high, but run a humidifier when the humidity is low. Meet in the middle. Yet another option: Build a tent ...

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It is probably not an answer good enough, but I try. My experiences with a small commercial dehumidifier were great when humidity was 100%. I tested it long term at 60% without big effect. I was trying to decrease humidity with Calcium Chloride type material and ventilator (Silica gel is probably safer but less efficient), it worked better but 10%, I have ...

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The problem is tackled and answered here.

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I was unable to see any Fraunhofer lines with the sun light, despite using a focusing lens. However, I tried examining the light of a fluorescent bulb instead. I didn't manage to project the image on a sheet of paper, but I was able to take a direct picture of the image in the prism. The result is a bit more satisfying: / Are these four lines a ...

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The resolving power of a prism is given by the formula $$\frac{\lambda}{\Delta \lambda} = b\ \frac{dn}{d\lambda},$$ where $b$ is the base length of the prism, $\lambda$ is the wavelength and $n(\lambda)$ is the refractive index. You don't say, but let's assume you are using a crown glass prism. According to this useful document, crown class has ...

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