Question
An object is placed at 60 m in front of a concave mirror. If its radius of curvature is 40 m, then find the image distance.
Answer: Option B
:
B
Given:
Radius of curvature, R=−40m
Object distance, u=−60m
Let the sign convention be such that the object distance is negative i.e. positive direction is taken along the direction of the incident ray.
From mirror formula,
1v+1u=1f
where:
v: Position of image
f: Focal length
But focal length is half of the radius.
⟹f=R2=−20m
⟹1v+1−60=1−20
v=−30m
Negative sign represents that object andimage are on the same side of mirror.
Was this answer helpful ?
:
B
Given:
Radius of curvature, R=−40m
Object distance, u=−60m
Let the sign convention be such that the object distance is negative i.e. positive direction is taken along the direction of the incident ray.
From mirror formula,
1v+1u=1f
where:
v: Position of image
f: Focal length
But focal length is half of the radius.
⟹f=R2=−20m
⟹1v+1−60=1−20
v=−30m
Negative sign represents that object andimage are on the same side of mirror.
Was this answer helpful ?
More Questions on This Topic :
Question 10. In the mirror shown, the reflected ray will ___.....
Submit Solution