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Chapter 33: Q.53 (page 957)

If sunlight shines straight onto a peacock feather, the feather appears bright blue when viewed from15鈭�on either side of the incident beam of light. The blue color is due to diffraction from parallel rods of melanin in the feather barbules, as was shown in the photograph on page 940. Other wavelengths in the incident light are diffracted at different angles, leaving only the blue light to be seen. The average wavelength of blue light is 470nm. Assuming this to be the first-order diffraction, what is the spacing of the melanin rods in the feather?

Short Answer

Expert verified

The feather's melanin rods are d=1.82渭minches apart.

Step by step solution

01

Step: 1 Wavelength of blue light:

High energy visible (HEV) light, often called blue light, has the shortest wavelength of actinic ray (role="math" localid="1649157295025" 380nm to 500nm) so produces the foremost energy.

02

Step: 2 Derivating part:

The grating spacing as

dsin鈦�胃m=m位d=m位sin鈦�胃m.

03

Step: 3 Finding spacing:

The spacing as

d=1脳4.7脳10鈭�7sin鈦�15鈭�d=1.82脳10鈭�6m.

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Most popular questions from this chapter

FIGURE P33.56shows the light intensity on a screen behind a single slit. The wavelength of the light is600nmand the slit width is 0.15mm. What is the distance from the slit to the screen?

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