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Question: 

A total of 35 bright and 35 dark Newton’s rings (not counting the dark spot at the center) are observed when 560-nm light falls normally on a planoconvex lens resting on a flat glass surface (Fig. 24–31). How much thicker is the lens at the center than the edges?

Newton’s rings. (a) Light rays reflected from upper and lower surfaces of the thin air gap can interfere.

Figure 24-31 Newton’s rings. (a) Light rays reflected from upper and lower surfaces of the thin air gap can interfere.

Newton’s rings. (b) Photograph of interference patterns using white light.

Figure 24-31 Newton’s rings. (b) Photograph of interference patterns using white light.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$9.8 \; \mu m$

Giancoli 7th Edition, Chapter 24, Problem 50

(5:31)

Chapter 24, Problem 50 is solved.

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