Advertisements
Advertisements
Question
In torches, search lights and headlights of vehicles the bulb is placed ______.
Options
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
Advertisements
Solution
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.
RELATED QUESTIONS
A simple microscope is used by watch repairers. Give reason.
Define the Focal length of a spherical mirror
State the two kinds of spherical mirror and distinguish them with the aid of proper diagrams.
State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.
Define the following terms in the context of spherical mirrors :
(i) Pole
(ii) Centre of curvature
(iii) Radius of curvature
(iv) Principal axis
State the types of mirrors used for (i) headlights and (ii) rear view mirror, in cars and motorcycles. Give to justify your answer in each case.
What is a spherical mirror?
What is meant by magnification? Write its expression. What is its sign for the (a) real (b) virtual, image?
Define the following term:
convex mirror
The following figure shows a concave mirror with its pole (P), focus (F), and center of curvature (C). Draw a ray diagram to show the formation of the image of an object AB by the concave mirror.
Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.
Define the term Pole.
Geometric centre of the spherical mirror is ______.
Define focal length.
An object is placed at a distance of 0.25 m
in front of a plane mirror. The distance between the object and image will be ______.
Define the radius of curvature.
