Perhaps to confuse a predator, some tropical gyrinid beetles (whirligig beetles) are colored by optical interference that is due to scales whose alignment forms a diffraction grating (which scatters light instead of transmitting it). when the incident light rays are perpendicular to the grating, the angle between the first-order maxima (on opposite sides of the zeroth-order maximum) is about 27° in light with a wavelength of 534 nm. what is the grating spacing of the beetle?

the grating space is given as

Explanation:

As we know that the angular position of first order maximum is given as

so we will have

so we have

So the grating space is given as

a red apple illuminated by a blue light will appear purple

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.