Science homework
Do these extra questions answers in your fair notebook
1. Name the types of reflection that takes place from an irregular surface?
2. Name the device used to detect objects at different heights?
3. Name the script that helps to read and write visually challenged people?
4. What type of mirror is used as a looking glass?
5. Which nerves pick up the message of the image formed at retina?
6. What are luminous and illuminated object?
7. What are the characteristics of images formed by the plane mirror?
8. What is the periscope? Where it is used?
9. List a few ways to take care of the eye?
10. Study the diagram of eye and answer the following questions;
a) which part form image of an object.
b) where is the image formed in human eye.
c) where does the light enter the eye from.
11. Can you see a rainbow after the rain if the sun does not believe to shine?
12. Identify following:
An eye defect in which lens become opaque.
This controls the size of pupil.
A device based on multiple reflection and fitted in a submarine.
The exchange of left and right side of image by plane mirror.
The nature of images formed by eye lens.
An infinite number of images are formed when two plane mirror are kept in this position.
The perpendicular lines drawn at the points of incidence.
The number of dots that compose one Braille cell.
PLEASE ANSWER THESE QUESTIONS
Answers
Answer:
1.For a smooth surface, reflected light rays travel in the same direction. This is called specular reflection. For a rough surface, reflected light rays scatter in all directions. This is called diffuse reflection.
2.A Displacement Sensor is a device that measures the distance between the sensor and an object by detecting the amount of displacement through a variety of elements and converting it into a distance.
3.Braille is a tactile reading and writing system. It opens up the written word to blind and visually impaired people.
4.Plane mirrors are used as looking glass. 2. Plane mirrors also have many scientific uses. In most of the measuring instruments, a plane mirror is placed under the scale and pointer.
6.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.
8.Periscope, optical instrument used in land and sea warfare, submarine navigation, and elsewhere to enable an observer to see his surroundings while remaining under cover, behind armour, or submerged.
9.Eat a healthy, balanced diet. ...
Maintain a healthy weight. ...
Get regular exercise. ...
Wear sunglasses. ...
Wear protective eye wear. ...
Avoid smoking. ...
Know your family medical history. ...
Know your other risk factors.