With spherical mirrors, we generally come across four distances parallel to and two distances perpendicular to the principal axis. Each of these six distances has a particular mathematical quantity associated with it. These quantities are given in table.
Distance | Quantity | Symbol |
From the pole to the object | object-distance | |
From the pole to the image | image-distance | |
From the pole to the focus | focal length | |
From the pole to the centre | radius of curvature | |
Height of the object | object-height | |
Height of the image | image-height |
The above definitions of u and v are for a point object placed on the principal axis. If an object is placed away from the principal axis, u corresponds to the distance from the pole to the foot of the perpendicular drawn from the object to the principal axis. Similarly, v corresponds to the distance from the pole to the foot of the perpendicular drawn from the image to the principal axis. The quantities and are defined for a linear, extended object placed perpendicular to the principal axis.
Which of the following are correct ? (a) The quantities and are defined only or a linear, extended object placed parallel to the principal axis. (b) If an object is placed away from the principal axis, v corresponds to the distance from the pole to the foot of the perpendicular drawn from the image to the principal axis. | |||
Right Option : B | |||
View Explanation |
Which of the following are correct ? (a) When object-height is positive and the image-height is negative we can say that the image is formed is inverted (b) When object-height is less that the image-height we can say that the image is formed is magnified. (c) When object-height and the image-height are both positive we can say that the image is formed is erect. | |||
Right Option : D | |||
View Explanation |
Which of the following are correct ? (a) When object-height is positive and the image-height is positive and are of equal value we can say that the image is formed is inverted (b) When object-height is more that the image-height and both are positive we can say that the image is formed is erect and diminished. | |||
Right Option : A | |||
View Explanation |
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.
My 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.
My 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.
One 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.
About 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.
It 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.
Abhyas 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.
It 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.
I 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
Being 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.