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

An object is placed at 60 cm from the pole of a concave mirror whose focal length is 20 cm. Find the distance at which the image is formed.

A
v= 20 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
v= 30 cm
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
v= +30 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
v= +20 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B v= 30 cm
For the concave mirror, let its focal length be f, the object distance be u, and the image distance be v.
According to the mirror formula,
1v + 1u = 1f
Given, u=60 cm, f=20 cm (using the sign conventions)
1v - 160 = 120

1v = 160120 = 1360 = 260 = 130

v=30 cm
The image distance is negative The image is formed on the same side of the mirror as the object, and is real (and inverted) in nature.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Image Formation by Spherical Mirrors - concept
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon