Question
An object is placed at infinity in front of a concave mirror. Where is the image formed?
The correct answer is
At the principal focus (F)
Concave Mirror Image Formation: Object at Infinity
When an object is placed at infinity in front of a concave mirror, the rays of light coming from the object are parallel to the principal axis.
Ray Behavior and Convergence
- Parallel rays striking the concave mirror reflect and converge at a specific point.
- According to the laws of reflection, all parallel rays converge at the principal focus (F) of the concave mirror after reflection.
Image Location
Therefore, when the object is at infinity:
- The image is formed at the principal focus (F).
- The image is highly diminished (point-sized), real, and inverted.
The correct option is that the image is formed at the principal focus (F).
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Important Questions from Mirrors and Images
- A concave mirror forms a real and inverted image of a distant object at a distance of $15 \text{ cm}$ from the mirror.
If an object is placed $20 \text{ cm}$ in front of this mirror, what will be the nature and magnification of the image formed? The number of images observable between two parallel mirror is
Which of the following pair is correct?
I. Mirror formula : (1/v) – (1/u) = (1/f)
II. Lens formula : (1/v) + (1/u) = (1/f)
- A beam of parallel light, originating from a distant source, is first incident on a convex lens with focal length $f_2$.
Subsequently, the light passes through the lens and then reflects from a concave mirror having a focal length $f_1$.
The concave mirror is placed at a distance $d$ from the convex lens.
For the light rays to retrace their original path and ultimately emerge from the lens as a parallel beam heading back towards the distant source, the separation distance $d$ between the lens and the mirror must be: A ray of light is made incident on a concave mirror, parallel to its principal axis. After reflection it will -
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