Advertisements
Advertisements
प्रश्न
Define the Focal length of a spherical mirror
Advertisements
उत्तर
The distance between the pole and the focus is called focal length of the mirror. It is measured in meter or cm.
APPEARS IN
संबंधित प्रश्न
A simple microscope is used by watch repairers. Give reason.
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
What name is given to the distance between spherical mirror and carbon paper?
The shiny outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror:
Which type of spherical mirror will it provide?
A student obtained a sharp image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting better value of focal length of the mirror, the subject teacher suggested him for focusing a well illuminated distant object. What should the student do?
(A) He should move the mirror away from the screen.
(B) He should move the mirror slightly towards the screen.
(C) He should move the mirror as well as the screen towards the newly selected object.
(D) He should move only the screen towards the newly selected object.
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.
Complete the following diagrams in Figure by drawing the reflected rays for the incident rays 1 and 2.
State the kind of mirror used
(a) By a dentist,
(b) As a search-light reflector.
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.
An object of height 2 cm is placed at a distance of 20 cm in front of a concave mirror of a focal length of 12 cm. Find the position, size, and nature of the image.
Define the following term:
spherical mirror
Define the following term in relation to concave mirror.
Principal axis
Define the following term in relation to concave mirror.
Aperture
Is real image always inverted?
AB is the object, A1B1 is its image. MM' is the position of the mirror. Complete the ray diagram and find the position of the center of curvature and focus of the mirror. Also, measure the focal length.
Define the term Focus of a concave mirror.
The distance from the pole to the focus is called ______.
The radius of curvature of a spherical mirror is 18 cm. What is the focal length of this mirror?
In the figure shown, the image of a real object is formed at the point I. AB is the principal axis of the mirror. The mirror must be:
