Mirror Formula
Mirror Formula
The Mirror Equation:
A relationship between the distance of the object from the pole (u), distance of the image from the pole (v) and the focal length (f) of the mirror is called the mirror formula.
In a spherical mirror ,the distance of the object from its pole is called the object distance.
The distance of the image from the pole of the mirror is called the image distance.
The distance of the principal focus from the pole is called focal length.
Relation Between u, v, f:
For any spherical mirror of small aperture, and for any position of the object, the three quantities u, v and f satisfy the simple algebraic relation given below.
| Mirror Equation |
Remember that u, v, f can be positive or negative depending on the geometry of the situation.
1. In the mirror formula the values of u,v and f are to be used according to their Cartesian sign convention .
2. The mirror formula is valid in all situation for all spherical mirrors and for all positions of the object .
Illustration: An object is placed at a distance of 30 cm from a concave mirror of focal length 20 cm. Where will the image be formed?
Solution:It is given that we have a concave mirror, so the focal length will be negative.
The distance of the object is always negative.
We have, u = -30 cm and f = -20 cm.
Also according to the mirror formula,
Substituting the values in the formula we get,
or v = -60 cm.
So, the distance of the image will be 60 cm from the mirror. Since v has a negative sign, the image is formed to the left of the mirror, i.e., in front of it.
Which of the following are correct ? (a) In a spherical mirror the relation between quantities u,v,and f is called mirror formula . (b) In a spherical mirror ,the distance of the object from its pole is called the object distance (u) . | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct ? (a) In a spherical mirror, the distance of the object from its pole is called the object distance . (b) The distance of the principal focus from the pole is called focal length . (c) In case of spherical mirror the relation between quantities u, v, f is called lens formula . | |||
| Right Option : A | |||
| View Explanation | |||
The distance of the image from the pole of the mirror is called the ___________________ . | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [20]
Abhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Aman Kumar Shrivastava
10thI 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
10thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
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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
10thOne 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
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
8thAbhyas is an institute of high repute. Yogansh has taken admission last year. It creates abilities in child to prepare for competitive exams. Students are motivated by living prizes on basis of performance in Abhyas exams. He is satisfied with institute.
Yogansh Nyasi
7thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
Aman Kumar Shrivastava
10thThird consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...
Ayan Ghosh
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
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Prisha Gupta
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Archit Segal
7thWe started with lot of hope that Abhyas will help in better understnding of complex topics of highers classes. we are not disappointed with the progress our child has made after attending Abhyas. Though need to mention that we expected a lot more. On a scale of 1-10, we would give may be 7.
Manya
8thWhen I have not joined Abhyas Academy, my skills of solving maths problems were not clear. But, after joining it, my skills have been developed and my concepts of science and SST are very well. I also came to know about other subjects such as vedic maths and reasoning.
Sharandeep Singh
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Eshan Arora
8thUsually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
Anika Saxena
8thAbhyas 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
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Upmanyu Sharma
7thIt 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.
