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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.
Why is a hole burnt in the carbon paper?
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उत्तर
A concave mirror converges light rays, and in this case it will converge the incoming parallel rays of the sun at its focus. Since the carbon paper was kept at the focus of the concave mirror, the hole was burnt into it.
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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?
Explain the following term related to spherical lenses:- principal axis
Image formed by a convex ______ is always virtual and smaller in size.
What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror of convex mirror)? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.
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
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.
Draw suitable diagrams to illustrate the action of (i) concave mirror and (ii) convex mirror on a beam of light incident parallel to the principal axis.
In each case (a) and (b), draw reflected rays for the given incident rays and mark focus by the symbol F.
Name the kind of mirror used to obtain :
A real and enlarged image
Upto what maximum distance from the pole the image in a convex mirror can be obtained? what will be the location of object then ?
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.
A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find
- the focal length of mirror
- position of image.
Answer the following question.
Write the modification in the curvature of the eye lens which enables us to see the nearby objects clearly?
Define the term Pole.
In torches, search lights and headlights of vehicles the bulb is placed ______.
The image formed in a plane mirror is always inverted.
How tall does a mirror have to be to fit an entire person’s body?
What is the focal length (f) of a mirror?
