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प्रश्न
Name the spherical mirror which has:
(a) virtual principal focus.
(b) real principal focus.
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उत्तर
The spherical mirror which has
(a) a virtual principal focus is a convex mirror
(b) a real principal focus is a concave mirror
APPEARS IN
संबंधित प्रश्न
Explain the following term related to spherical lenses:- aperture
A ray of light is incident on a plane mirror at an angle of 30°. What is the angle of reflection
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.
At which point of the spherical mirror the carbon paper is placed?
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?
Write true or false
A virtual image formed by a spherical mirror is always erect and situated behind the mirror.
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.
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.
Name the two kinds of spherical mirrors and distinguish between them.
Draw a ray diagram to show the formation of image by a concave mirror for the object beyond its centre of curvature. State three characteristics of the image.
Does the mirror mentioned in part (b) form real image for all locations of the object?
Answer the following question.
Write the modification in the curvature of the eye lens which enables us to see the nearby objects clearly?
What is the relation between focal length and radius of curvature of a concave mirror?
What do you understand by the term real image?
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.
The distance from the center of curvature of the mirror to the pole is called the focal length of the 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:
Define the following terms in the context of a diverging mirror:
- Principal focus
- Focal length
Draw a labelled ray diagram to illustrate your answer.
Visit a nearby hospital. You can also visit the clinic of an ENT specialist, or a dentist. Request the doctor to show you the mirrors used for examining ear, nose, throat and teeth. Can you recognise the kind of mirror used in these instruments?
