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प्रश्न
State where an object must be placed so that the image formed by a concave mirror is:
(b) at infinity.
(c) the same size as the object.
उत्तर
(a) an object must be placed Between pole and focus of the mirror so that the image formed by a concave mirror is erect and virtual.
(b) an object must be placed At the focus of the mirror so that the image formed by a concave mirror is at infinity.
(c) an object must be placed At the center of curvature of the mirror so that the image formed by a concave mirror is the same size as the object.
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संबंधित प्रश्न
The real image formed by a concave mirror is smaller than the object if the object is:
(a) between centre of curvature and focus
(b) at a distance greater than radius of curvature
(c) at a distance equal to radius of curvature
(d) at a distance equal to focal length
An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.
At what distance from a concave mirror focal length 10 cm should an object 2 cm long be placed in order to get an erect image 6 cm tall?
An object 3 cm high is placed at a distance of 8 cm from a concave mirror which produces a virtual image 4.5 cm high:
(i) What is the focal length of the mirror?
(ii) What is the position of image?
(iii) Draw a ray-diagram to show the formation of image.
Which of the following are concave mirrors and which convex mirrors?
Shaving mirrors, Car headlight mirror, Searchlight mirror, Driving mirror, Dentist's inspection mirror, Touch mirror, Staircase mirror in a double-decker bus, Make-up mirror, Solar furnace mirror, Satellite TV dish, Shop security mirror.
Why does a beam of light when it enters glass at an angle? Why does it not bend if it inters the glass at right angles?
With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram.
According to cartesion sign convention, which mirror and which lens has negative focal length?
Concave mirrors are used by dentists to examine teeth. Why?
Which type of mirror is used in the following?
Shaving mirror
