Lens Formula
Lens Formula
If we place an object at a distance u from the optical centre 'O' and its image is formed at a distance v then
This relationship is known as lens formula. Here f is the focal length of this lens.
Proof:
Consider an object AB placed beyond 2F in front of a convex lens. On the other side of lens an image is formed between F and 2F which is real, inverted and smaller in size. Applying the sign conventions :
Object distance (OB ):= -u
Image distance(OB') := v
Focal length(OF): = +f
In and
=
( vertically opposite angle)
=
( each
)
(By AA similarity)
Lens formula is given as ? | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct ? (a) The lens formula u stands for object distance . (b) The lens formula v stands for image distance . (c) The lens formula f stands for focal length. | |||
| Right Option : D | |||
| View Explanation | |||
In the lens f' stands for ._____________. | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [20]
When 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.
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7thMy 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
8thIn 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...
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10thThe experience was nice. I studied here for three years and saw a tremendous change in myself. I started liking subjects like English and SST which earlier I ran from. Extra knowledge gave me confidence to overcome competitive exams. One of the best institutes for secondary education.
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Ayan Ghosh
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Hridey Preet
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Yogansh Nyasi
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
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Shivam Rana
7thIt 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
10thUsually 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...
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8thWe 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
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Ayan Ghosh
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