Which of the following mirrors is used as a shaving mirror to get a magnified image of the face?
Shaving Mirror Magnification Explained
A shaving mirror is specifically designed to provide a magnified view of the user's face. This magnification allows for easier and more precise shaving.
Mirror Type Analysis
Let's analyze the properties of different mirrors concerning image formation:
- Plane Mirror: Forms a virtual, erect image of the same size as the object. It does not magnify.
- Convex Mirror: Forms a virtual, erect, and diminished image. It provides a wider field of view but does not magnify the object.
- Concave Mirror: Depending on the object's position, a concave mirror can form different types of images. When the object (face) is placed between the pole (P) and the principal focus (F), the concave mirror forms a virtual, erect, and magnified image. This is ideal for a shaving mirror.
- Parabolic Mirror: While similar in focusing properties to concave mirrors, the specific application of a shaving mirror relies on the magnification properties typically associated with a standard concave mirror.
Conclusion on Mirror Choice
To achieve the necessary magnification for shaving, a concave mirror is the appropriate choice. It provides an enlarged, erect image of the face when held at a suitable distance (closer than its focal length).
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 -
