Advertisements
Advertisements
प्रश्न
Define the term Centre of curvature.
Advertisements
उत्तर
Centre of curvature is the centre of the imaginary sphere to which the mirror belongs.
APPEARS IN
संबंधित प्रश्न
A student focused the Sun rays using an optical device 'X' on a screen S as shown.
From this it may be concluded that the device 'X' is a (select the correct option)
(A) Convex lens of focal length 10 cm.
(B) Convex lens of radius of curvature 20 cm.
(C) Convex lens of focal length 20 cm.
(D) Concave mirror of focal length 20 cm.
Define the following term in the context of spherical mirrors:- Principal focus
A ray of light is incident on a plane mirror at an angle of 30°. What is the angle of reflection
Name the kind of mirror used to obtain:
A virtual and enlarged image
Why does a driver use a convex mirror instead of a plane mirror as a rear view mirror?
Illustrate your answer with the help of a ray diagram.
(a) When a concave mirror is used as a shaving mirror, where is the person's face in relation to the focus of mirror?
(b) State three characteristics of the image seen in part (a).
At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object.
Choose the correct alternative and rewrite the following:
Mirror used by a dental surgeon is ..........................
AB is the object, A'B' is the image, and MM' is the position of the mirror. Complete the ray diagram showing the formation of the image and find the focal length of the 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?
