Advertisements
Advertisements
प्रश्न
Concave mirrors are used by dentists to examine teeth. Why?
Advertisements
उत्तर
As a dentist’s head mirror: You would have seen a circular mirror attached to a band tied to the forehead of the dentist/ENT specialist. A parallel beam of light is made to fall on the concave mirror; this mirror focuses the light beam on a small area of the body (such as teeth, throat etc.).
APPEARS IN
संबंधित प्रश्न
An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm. If the distance of the object from the optical centre of the lens is 20 cm, determine the position, nature and size of the image formed using the lens formula.
Draw a ray diagram to show the path of the refracted ray in each of the following cases:-
A ray of light incident on a concave lens is
(i) passing through its optical centre.
(ii) parallel to its principal axis.
(iii) directed towards its principal focus.
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
For what position of an object, a concave mirror forms a real image equal in size to the object?
With the help of a labelled ray diagram, describe how a converging mirror can be used to give an enlarged upright image of an object.
What is the position of the image when an object is placed at a distance of 20 cm from a concave mirror of focal length 20 cm?
If the image formed is always virtual, the mirror can be:
(a) concave or convex
(b) concave or plane
(c) convex or plane
(d) only convex
The image formed by a concave mirror is of the same size as the object, if the object is placed
A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.
You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from
