Recent content by nbb

Thanks, that's great.

Thanks for the prompt reply. I've used 1/f = (n-1)(1/R1 - 1/R2) with R2 as a negative value to find f to be 0.2m. Which is not what I thought before. Then I've used 1/u + 1/v = 1/f for the second lens with v = 0.3m to calculate u for the second lenses to be 0.6m. If the image after...

I am trying past paper exam questions for my wave optics paper and have got stuck on this question. Two identical biconvex lenses of refractive index 1.5 and with radius of curvature of 20cm on each side are to be used to produce a real erect image of incoming parallel rays. If the image is...