Gratings can act to receive light, and thereby apply the light to a waveguide, as well as to deflect a light from a waveguide.
डाक्टरले बताएअनुसार शुक्रबारदेखि उनको छाती दुख्न थालेको छ भने रक्तचाप पनि न्यून हुँदै गएको छ ।