Advertisements
Advertisements
प्रश्न
Why are the mirrors fitted on the outside of cars convex?
Advertisements
उत्तर
- The image formed by a convex mirror is small and straight.
- This image remains straightforward; But as we move the mirror further away from the object, the image becomes smaller.
- As a result, we see all the surrounding images in the mirror.
- The use of convex mirrors in the outside of the vehicle gives the driver a straight, narrow and clear image of the vehicles behind the vehicle.
- Therefore, the mirror fitted on the outside of the vehicle is convex.
APPEARS IN
संबंधित प्रश्न
Define the radius of curvature of spherical mirrors.
If the focal length of a spherical mirror is 12.5 cm, its radius of curvature will be:
(a) 25 cm
(b) 15 cm
(c) 20 cm
(d) 35 cm
What is the nature of a mirror having a focal length of, +10 cm?
Which mirror has a wider field of view?
How will you distinguish between a plane mirror, a concave mirror and a convex mirror without touching them?
A man standing in front of a special mirror finds his image having a very small head, a fat body and legs of normal size. What is the shape of:
(a) top part of the mirror?
(b) middle part of the mirror?
(c) bottom part of the mirror?
Give reasons for your choice.
The radius of curvature of a convex mirror used as a rear view mirror in a moving car is 2.0 m. A truck is coming from behind it at a distance of 3.5 m. Calculate
- position and
- size of the image relative to the size of the truck.
- What will be the nature of the image?
A shop security mirror 5.0 m from certain items displayed in the shop produces one-tenth magnification.
- What is the type of mirror?
- What is the radius of curvature of the mirror?
Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed:
- at 2F1,
- between F₁ and the optical centre O of the lens.
Which of the above two cases shows the use of a convex lens as a magnifying glass? Give reasons for your choice.
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
Write true or false
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
A ............ mirror always forms a virtual image.
The diagram given below in fig shows a ray of light AO falling on a surface separating two media. Draw the refracted ray in each, case.
A driver uses a convex mirror as a rearview mirror. Explain the reason with the help of a ray diagram.
List four properties of the image formed by a convex mirror when object is placed between focus and pole of the mirror.
An object at a distance of +15 cm is slowly moved towards the pole of a convex mirror. The image will get ______.
Identify the device used as a spherical mirror or lens in following case, when the image formed is virtual and erect in case.
Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.
The image formed by a convex mirror is always ______.
Match the following.
| Column I | Column II |
| Convex mirror | Radio telescopes |
| Parabolic mirror | Rear-view mirror |
| Snell’s law | Kaleidoscope |
| Dispersion of light | sin i/sin r =μ |
| Refractive index | Rainbow |
