wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

For the arrangement shown in the figure, find the final magnification of the extended object AB after two successive reflections. Take the first reflection from mirror M1.

A
+1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
+2
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B +2
For mirror M1,
u=30 cm
f=20 cm
So, 1v+1u=1f
1v130=120
1v=160
v=60 cm
So, m1=vu=(60)30=2
For mirror M2,
The image formed by mirror M1 will act as a virtual object for mirror M2,
u=+(6040)=+20 cm
f=+10 cm
So, 1v+1u=1f
1v+120=110
1v=120
v=20 cm
So, m2=vu=2020=1
Now, final magnification of the extended object,
m=m1m2=2×1=+2
Why this question ?

Tip: Image formed by one mirror act as object for other mirror.

flag
Suggest Corrections
thumbs-up
2
Join BYJU'S Learning Program
Join BYJU'S Learning Program
CrossIcon