Advertisements
Advertisements
प्रश्न
Define (a) centre of curvature (b) radius of curvature (c) pole (d) principal axis, and (e) aperture, of a spherical mirror with the help of a labelled diagram
Advertisements
उत्तर
(a) Centre of curvature (C) – It is the centre of the sphere from which the mirror is formed.
(b) Radius of curvature (R) – It is the radius of the sphere from which the mirror is formed.
R = PC
(c) Pole (P) – Pole is the centre of the curved mirror surface, MM’.
(d) Principal axis – It is the line joining P and C.
(e) Aperture – It is the effective length of the mirror, i.e. MM’.
APPEARS IN
संबंधित प्रश्न
What is a virtual image?
Which type of mirror can form a real image?
What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror of convex mirror)? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.
How is a spherical mirror used to converge a beam of light at a point? Name the type of mirror used.
A student obtained on a screen the sharp image of a candle flame placed at the farther end of laboratory table using a concave mirror. For getting better value of focal length of the mirror, the teacher suggested to him to focus the sun. What should the student do?
(A) Should move the mirror away from the screen.
(B) Should move the mirror towards the screen.
(C) Should move the mirror and screen both towards the sun.
(D) Should move only the screen towards the sun.
Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case.
What is a spherical mirror?
Draw suitable diagrams to illustrate the action of (i) concave mirror and (ii) convex mirror on a beam of light incident parallel to the principal axis.
What type of mirror can be used to obtain a real image of an object?
What is meant by magnification? Write its expression. What is its sign for the (a) real (b) virtual, image?
A real and enlarged image can be obtained by using a
Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed :
(i) between the optical centre and principal focus of a convex lens.
(ii) anywhere in front of a concave lens.
(iii) at 2F of a convex lens.
State the signs and values of magnifications in the above-mentioned cases (i) and (ii).
Define the following term:
convex mirror
What is a mirror formula?
The boxes in figure (a, b, c) represent mirrors; insert a mirror which will reflect the incident ray as shown in the diagram.
The distance from the pole to the focus is called ______.
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?
