Advertisements
Advertisements
प्रश्न
In torches, search lights and headlights of vehicles the bulb is placed ______.
पर्याय
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
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
A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X).
Explain the following term related to spherical lenses: focal length
A ray of light is incident normally on a plane mirror. What will be the
angle of reflection?
Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case.
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.
The image formed by a convex mirror is of size one third the size of object. How are u and v related?
Define the following term in relation to concave mirror.
Pole
Define the term Principal axis.
Define the following terms in the context of a diverging mirror:
- Principal focus
- Focal length
Draw a labelled ray diagram to illustrate your answer.
