What happens when light falls on opaque objects?
Opaque objects do not allow light to pass through them. Transparent objects allow light to pass through them and we can see through these objects clearly. Translucent objects allow light to pass through them partially. Shadows are formed when an opaque object comes in the path of light.
What 3 things happen to light when it hits a surface?
What happens when light hits a different material? Light travels in straight lines through a material (like air) until it hits a different material. Then it can be absorbed reflected or • Then, it can be absorbed, reflected, or transmitted (which means “passed through”).
What happens when light falls on a smooth polished surface?
When light falls on a polished smooth surface such as mirror, metal surface and clear water, it bounces back and the phenomena is called reflection of light. The ray of light which falls on the polished surface is called incident ray and the ray that bounces back is called reflected ray.
When light falls on a smooth polished surface most it?
When light falls on a smooth polished surface, most of it is reflected in the same direction., and this type of reflection is known as regular or specular reflection.
Which type of surface is best able to reflect light a rough cloudy surface a rough polished surface a smooth polished surface a smooth cloudy surface?
Answer; A smooth, polished surface. Explanation; -Reflection is the bouncing back of light when it hits a surface or a boundary.
What are the two types of convex lens?
Types of Convex Lens:
- Plano-convex Lens: It is curved outwards from one side and the other side plane. It is positive focal length elements that have one spherical surface and one flat surface.
- Double Convex Lens: It is curved outwards from both the side.
- Concave-convex Lens:
How does the letter E as seen through the microscope differ from the way an e normally appears?
How does the letter “e” as seen through the microscope differ from the way an “e” normally appears? It is inverted, not solid, has rough edges, and shows the texture of the paper. What happens when you move the slide to the upper right while looking through the eyepiece? It moves to the lower left of the scope.
What property of the compound microscope is apparent when viewing the letter E?
Compare the orientation of the letter “e” as viewed through the microscope with the letter “e” viewed with the naked eye on the slide. This demonstrates that in addition to being magnified the image is inverted.
Why do bacteria have to be stained?
Bacteria are stained for better visual observation, to highlight differences, to enhance cell components, to help identify the bacterium, etc.
What is the effect of adding safranin to the positive and negative Gram staining bacteria?
A counterstain, such as the weakly water soluble safranin, is added to the sample, staining it red. Since the safranin is lighter than crystal violet, it does not disrupt the purple coloration in Gram positive cells. However, the decolorized Gram negative cells are stained red.
Why is Gram stain important in classifying bacteria?
The Gram stain is a very important preliminary step in the initial characterization and classification of bacteria. It is also a key procedure in the identification of bacteria based on staining characteristics, enabling the bacteria to be examined using a light microscope.
What happens if you reverse crystal violet and safranin stains?
If you reverse the staining procedure that is using safranin first, this will cause all the bacteria to remain red and crystal violet applied later on may cause the gram-negative bacteria to become violet in color and the gram -positive bacteria will remain red.