Advertisements
Advertisements
Question
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?
Advertisements
Solution
The carbon paper was kept at the focus of the spherical mirror.
APPEARS IN
RELATED QUESTIONS
One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a ray diagram to justify your answer. A 4 cm tall object is placed perpendicular to its principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and the size of the image.
Explain the following term related to spherical lenses:- optical centre
Explain the following term related to spherical lenses:- centres of curvature
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.
What is the advantage of using a carbon paper rather than a white paper?
A coin placed at the bottom of a vessel appears to be raised when water is poured in the vessel.
Define the terms pole, principal axis and centre of curvature with reference to a spherical mirror.
Explain the meaning of the terms focus and focal length in case of a convex mirror, with the help of suitable ray diagram.
State the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain your answer with the help of suitable ray diagrams.
Upto what maximum distance from a concave mirror, the image can be obtained? What will be the location of object for it?
Upto what maximum distance from the pole the image in a convex mirror can be obtained? what will be the location of object then ?
For an incident ray directed towards centre of curvature of a spherical mirror the reflected ray:
A concave mirror forms a virtual image of size twice that of the object placed at a distance 5 cm from it.
Find : (a) the focal length of the mirror (b) position of image
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.
An object is placed at 4 cm distance in front of a concave mirror of radius of curvature 24 cm. Find the position of image. Is the image magnified?
Define the following term in relation to concave mirror.
Radius of curvature
What is the difference between virtual images of an object formed by a concave mirror and a convex 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?
