Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • NCERT
  • Use the mirror equation to deduce that: an object placed between f and 2f of a concave mirror produces a real image beyond 2f.

Q 9.15 (a) Use the mirror equation to deduce that: 

                    an object placed between f and 2f of a concave mirror produces a real image beyond 2f.

Answers (1)

best_answer

The equation we have for a mirror is:

\frac{1}{f}=\frac{1}{v}+\frac{1}{u}

\frac{1}{u}=\frac{1}{f}-\frac{1}{v}

Given condition  f<u<2f and v>2f

                          \frac{1}{2f}<\frac{1}{u}<\frac{1}{f}        and  \frac{1}{v}<\frac{1}{2f}

            -\frac{1}{2f}>-\frac{1}{u}>-\frac{1}{f}

            \frac{1}{f}-\frac{1}{2f}>\frac{1}{f}-\frac{1}{u}>\frac{1}{f}-\frac{1}{f}

             \frac{1}{2f}>\frac{1}{v}>0

          {2f}<{v}<0

Here f has to be negative in order to satisfy the equation and hence we conclude that our mirror is a concave Mirror. It also satisfies that -v>-2f(image lies beyond 2f)

Posted by

Pankaj Sanodiya

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

Board Exam Date Sheet 2025: CBSE, UPMSP, MPBSE, Class 10, 12 board exam dates out; BSEB, CGBSE schedules soon
anam-khan

CBSE Date Sheet 2025 (Out) Live: Class 10, 12 board exam time table at cbse.gov.in; syllabus, sample papers
anam-khan

CBSE Class 12 board exam date sheet 2025 out; exams from February 15 to April 4

Latest Question