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प्रश्न
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.
What name is given to the distance between spherical mirror and carbon paper?
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उत्तर
The distance between the mirror and the carbon paper is the focal length.
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संबंधित प्रश्न
A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?
We can obtain an enlarged and erect image by a convex mirror.
Name the two types of spherical mirrors. What type of mirror is represented by the:
front side of a shining steel spoon?
Name the spherical mirror which can produce a virtual and diminished image of an object.
A concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. The focal length of the lens is:
(a) 50 cm
(b) 40 cm
(c) 60 cm
(d) 30 cm
An optical device has been given to a student and he determines its focal length by focusing the image of the sun on a screen placed 24 cm from the device on the same side as the sun. Select the correct statement about the device.
(A) Convex mirror of focal length 12 cm
(B) Convex lens of focal length 24 cm
(C) Concave mirror of focal length 24 cm
(D) Convex lens of focal length 12 cm
Name the spherical mirror which (i) diverges (ii) converges the beam of light incident on it. Justify your answer by drawing a ray diagram in each case.
State whether the image in part (a) is real or virtual?
State two uses of a concave mirror.
Draw a ray diagram to show the formation of image of an object kept in front of a convex mirror. State three characteristics of the image.
The radius of curvature of a convex mirror is 40 cm. Find its focal length.
Define the following term in relation to concave mirror.
Radius of curvature
The diagram below shows the parallel rays incident on a convex mirror. C is the centre of the curvature of the mirror. By drawing the paths of the reflected rays, label the focus F and hence find the focal length of the mirror.
Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.
In torches, search lights and headlights of vehicles the bulb is placed ______.
A spherical mirror whose reflecting surface is curved outwards is called ______ mirror.
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?
