Concave Mirror Functionality
Concave mirrors are used in torches and car headlights because they possess a unique property related to light reflection.
Parallel Beam Production
The primary reason for using a concave mirror in these applications is its ability to produce a parallel beam of light.
- When a light source (like a bulb) is placed at the focal point (F) of the concave mirror, the light rays emanating from it strike the mirror's surface.
- According to the laws of reflection, these rays are reflected outwards in a highly parallel beam.
- This focused, parallel beam travels a significant distance without spreading out rapidly, which is essential for effective illumination in torches and for the headlights of vehicles to light up the road ahead clearly.
Incorrect Option Explanations
- Option 1 is incorrect because concave mirrors can form both real and virtual images depending on the object's position relative to the focal point and center of curvature.
- Option 2 is incorrect; concave mirrors converge light, which typically increases the intensity or brightness in the direction of the beam, rather than reducing it.
- Option 4 is incorrect as concave mirrors are designed to focus or collimate light into a beam, not scatter it in all directions. Scattering is typical of diffuse surfaces.
Therefore, the capability to generate a parallel beam of light makes concave mirrors ideal for torches and headlights.
Similar Questions
An object is placed at a distance of 20 cm from a convex lens of focal length 10 cm. The image is formed at a distance of:
When white light is dispersed by a glass prism into seven colours, out of the following colours which colour will be deviated the least?
When a ray of light travels from a denser medium to a rarer medium, it bends ________.
- If the angle of incidence formed on a concave mirror at a point is 30 ° then the angle of reflection will be:
- The line joining the centre of curvature and the pole of a given spherical mirror is called __________.
- When white light passes through a prism, different colours of light bend through different angles. Which colour bends the least and which bends the most?
- A symmetrical biconvex lens of focal length '\(f\)' is cut into four identical pieces along and perpendicular to its principal axis The focal length of each of four pieces is
- Complete the statement with correct option.
In dispersion without deviation,_________________ - A thin prism $P_1$ of angle $4^\circ$ and refractive index 1.54 is combined with another thin prism $P_2$ of refractive index 1.72 to produce dispersion without deviation. The angle of $P_2$ is
An object is placed at the centre of curvature of a concave mirror. Its image is formed at:
Important Questions from Optics
Who was the first one to use a glass prism to obtain the spectrum of sunlight?
Twinkling of stars is due to:
In which a convex mirror is used?
A. Rear View mirrors in vehicles
B. Glass windows
C. Makeup Mirror
D. Kaleidoscope
What is the reason for formation of Mirage in desert?
An object is placed 10 cm in front of a lens. The image formed is real, inverted and of same size as the object. What is the focal length and nature of the lens?
