- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
An object of height 1.2m is placed before a concave mirror of focal length 20cm so that a real image is formed at a distance of 60cm from it. Find the position of an object. What will be the height of the image formed?
Given: f = -20 cm; v = -60 cm
To find: Height of the image formed
Solution:
From mirror formula,
$\frac{1}{u}=\frac{1}{f}-\frac{1}{v}$
$\frac{1}{u}=\frac{1}{-20}-\frac{1}{-60}$
$\frac{1}{u}=-\frac{1}{20}+\frac{1}{60}$
$\frac{1}{u}=-\frac{1}{30}$
So u = - 30 cm
Position of an object is 30 cm in front of the mirror
magnification, $m =\frac{h_{i}}{h_{o}} =\frac{-v }{u}$
$h_{i} =\frac{-(-60) }{-30} \times 1.2$
height of image = -2.4 m
Advertisements
To Continue Learning Please Login
Login with Google