Line of Sight Or Horizontal Level
Line of Sight Or Horizontal Level
Introduction: Trigonometry, is often used in the measurement of heights and distances of objects which can not be measured by physical measuring devices. For example, trigonometry was used to find the distance of stars from the Earth. Even today, in spite of more accurate methods being available, trigonometry is often used for making quick and simple calculations regarding heights and distances of far-off objects. In this chapter, we shall apply the trigonometric ratios to solve the problems regarding heights and distances of various objects without measuring them.
To apply trigonometric ratios to find the distance or the height of the object certain terms should be clear to us. Let us consider the case of an object as shown in the figure below
Horizontal Level: A horizontal level is a line which is parallel to the ground . In the figure line BC represents the horizontal level.
Line of Sight: When the human eye looks at some object then the line made by the vision to the object is called the Line of Sight.In the figure the eye is at point C (eye) and the object is placed at point A. Then the straight line AC between the eye and the object is called the line of sight.
Illustration: Identify the line of sight and horizontal level for the object at point C in the figure when the eye of the observer is at point B
Solution: When the object is at Point C and the eye of the observer is at B then
Line of sight is represented by BC
Horizontal Level is represented by BD
Identify the Horizontal level and line of sight respectively for the object at point A in the figure when the eye of the observer is at point B
| |||
| Right Option : C | |||
| View Explanation | |||
Identify the Line of sight for the object at point A in the figure when the eye of the observer is at point C
| |||
| Right Option : C | |||
| View Explanation | |||
Identify the Horizontal level and line of sight respectively for the object at point B in the figure when the eye of the observer is at point D
| |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [10]
Abhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
8thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
