wave-optics

Question: A zone plate of focal length $60\,cm,$ behaves as a convex lens, If wavelength of incident light is $6000\,\,{\AA},$ then radius of first half period zone will be

1) $36 \times {10^{ - 8}}m.$

2) $6 \times {10^{ - 8}}m.$

3) $\sqrt 6 \times {10^{ - 8}}m.$

4) $6 \times {10^{ - 4}}m.$

Solution:

Explanation: No Explanation

Diffraction of Light

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