Q&A -Ask Doubts and Get AnswersPrevious Next
Light - Reflection and Reflection
An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.
Here, the given lens is a convex lens.
Object Distance () = -25 cm
Focal length () = +10 cm
Height of object () = 5 cm
Object distance ( ) is taken negative as their distances from the optical centre of the lens is measured opposite to the direction of the incident light.
And, focal length () is taken positive because the lens is converging in nature.
Using the lens formula,
The positive sign of indicates that the image is formed on the other side of the convex lens at a distance of 16.66 cm. That is image is real in nature.
Here, the magnification is negative and less than 1. The negative sign indicates that the image is inverted and value less than 1 indicates that the size of the image is smaller than the object.
The negative sign of image height indicates that the image is inverted.
Therefore, the image is formed at a distance of 16.66 cm on the other side of the lens. The image formed is 3.3 cm tall and it is real and inverted.
The ray diagram given below shows the position, nature and size of the image.
Related Questions for Study
What our students and parents say about us!
Saiyam is using EduSaksham online courses from past one year. He is able to complete his tutorials, worksheets, and assignments on his own. Once he is done with worksheets, he can check his answers and if he has done any mistakes, then he can check the correct answers and explanations. They have been given so well that he is able to understand them himself and rarely he asks us for any clarification. He enjoys using the platform and has learned and improved a lot in Mathematics. I would recommend EduSaksham to all parents who want their kids to learn in a structured way and also enjoy the learning process.
Neeraj (Saiyam's Father)
I would like to thank Edusaksham on behalf of my son Aditya who attended " Math Olympiad crash course for 5 weeks". As per Aditya, this course helped him to understand new topics like Roman numerals and decimal places which were not taught in his school till date and had a better understanding of other topics. I personally thank EduSaksham for all the help and support.
Geeta Bansal (Aditya's Mother)
We had a good experience with EduSaksham. Because sheets are available online, Vedant enjoyed doing more and more sheets without any reminders. I could leave him on his own as he was very much motivated to cover the topics. Practice is very important in maths but it becomes difficult for us to prepare sheets, I am glad we found EduSaksham where in a lot of in a lot of sheets are available for practice and the quality of questions are also good. As it's a venture from IITians we could think of giving it a try and I am glad we tried
Shikha Chowdhary (Vedant's Mother)
I have grown up in a family where my father used to give me practice maths paper every day which I need to finish before I go to play. I think that strong foundation of solving new questions every day helped me to clear my IITJEE exam. But as working women, I always had time challenge to create practice Math papers for my daughter. Thanks to EduSaksham, their questions are so logical and conceptual that I don't feel the guilt of not creating practice questions by myself :). There are plenty of worksheet along with the tutorials for each chapter. It has made parents life easier :) And the best part is my daughter loves doing it. Thank you EduSaksham.