Answer in short?
1.what are luminous object?
2. what is umbra?
3.What is Penumbra?
4. Explain Shadow?
5. What is beam of light?
Answers
Answer:
1.Luminous objects are objects that generate their own light.
2.a completely dark area on the earth caused by the moon, or a completely dark area on the moon caused by the earth, during an eclipse
3.The penumbra (from the Latin paene "almost, nearly") is the region in which only a portion of the light source is obscured by the occluding body. An observer in the penumbra experiences a partial eclipse.
4.A shadow is a dark (real image) area where light from a light source is blocked by an opaque object.
5.A light beam or beam of light is a directional projection of light energy radiating from a light source.
Explanation:
Answer:
1.Luminous objects are objects that generate their own light. Illuminated objects are objects that are capable of reflecting light to our eyes. The sun is an example of a luminous object, while the moon is an illuminated object. During the day, the sun generates sufficient light to illuminate objects on Earth.
2.the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse.
3.the partially shaded outer region of the shadow cast by an opaque object.
4.A shadow is a dark area where light from a light source is blocked by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or a reverse projection of the object blocking the light.
5.A light beam or beam of light is a directional projection of light energy radiating from a light source. Sunlight forms a light beam (a sunbeam) when filtered through media such as clouds, foliage, or windows. ... Light from certain types of laser has the smallest possible beam divergence.