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प्रश्न
In torches, search lights and headlights of vehicles the bulb is placed ______.
विकल्प
between the pole and the focus of the reflector
very near to the focus of the reflector
between the focus and centre of curvature of the reflector
at the centre of curvature of the reflector
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उत्तर
In torches, search lights and headlights of vehicles the bulb is placed very near to the focus of the reflector.
Explanation -
In torches, search lights and headlights of vehicles concave mirrors are used. When a light source is placed at the focus of the mirror, after reflection light rays become parallel to the principal axis. Due to this, the bulb is placed very near to the focus of the reflector.
संबंधित प्रश्न
Explain the following term related to spherical lenses:- principal focus
Define Radius of curvature of the spherical mirror
A ray of light travels from a denser medium to a rarer medium. How will it bend?
Which are the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain with the help of suitable ray diagrams.
Write the spherical mirror's formula and explain the meaning of each symbol used in it.
Draw a ray diagram to show the formation of image of an object kept in front of a convex mirror. State three characteristics of the image.
A concave mirror forms a virtual image of size twice that of the object placed at a distance 5 cm from it. Find:
- the focal length of the mirror
- position of image
A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find
- the focal length of mirror
- position of image.
A straight stick partly dipped in water obliquely appears to be bent at the surface of the water.
An object 5 cm high forms a virtual image of 1.25 cm high, when placed in front of a convex mirror at a distance of 24 cm. Calculate:
- the position of the image
- the focal length of the convex mirror.
Define the following term:
concave mirror
Define the term Aperture.
An object 10 cm high is placed at a distance of 20 cm in front of a spherical mirror of focal length 25 cm. By scale drawing find the nature, position, and magnification of the image in the following case:
Convex mirror
If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens?
Name the type of mirror used in the following situation:
Solar furnace
Support your answer with reason.
Name the two types of spherical mirrors.
The image formed in a plane mirror is always inverted.
