NEET 2012
- Exam
- NEET
- Year
- 2012
- Subject
- Physics
- Chapter
- Ray Optics
NEET 2012 · Physics · Ray Optics
A rod of length 10 ~cm lies along the principal axis of a concave...
A rod of length lies along the principal axis of a concave mirror of focal length in such a way that its end closer to the pole is away from the mirror. The length of the image is
Options
- A
- B
- C
- D
Correct answer
D.
Step-by-step solution
By mirror formula, image distance of A 
of C$
v_C=-20 \mathrm{~cm}The length of image =\left|v_A-v_C\right|
=|-15-(-20)|
=5 \mathrm{~cm}
of C$
v_C=-20 \mathrm{~cm}The length of image =\left|v_A-v_C\right|
=|-15-(-20)|
=5 \mathrm{~cm}