The primary mirror of the James Webb Space Telescope consists of 18 hexagonal seg-ments. To measure the step (height offset) between two adjacent segments, a blockeris inserted in the science instrument to only view a small patch of the mirror across twoneighboring segments. The light from a star on this patch is then dispersed in wavelengthvia a grating, with a linear dispersion of 10 μm nm-¹ onto a detector, with the wavelength of1500 nm falling at the centre of the detector.Bright fringes are observed at -2.5 and +2.5 mm from the centre of the detector, with afurther 41 bright and 42 dark fringes near equally spaced in between these positions.Calculate the step offset between the two mirror segments.

To find the step offset between two mirror segments, we can use the information provided about the…

Answered: The primary mirror of the James Webb…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter27: Wave Optics

Section: Chapter Questions

Problem 38P

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Suppose you have a lens system that is to be used primarily for 700-nm red light. What is the second thinnest coating of fluorite (magnesium fluoride) that would be nonreflective for this wavelength?
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