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प्रश्न
What type of image is formed:
on a cinema screen?
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उत्तर
The image formed on a cinema screen is real because it is formed due to an actual meeting of the light rays.
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संबंधित प्रश्न
An image formed by a ______ mirror is always of the same size as that of the object.
Define Radius of curvature of the spherical mirror
What type of image is formed:
in a plane mirror?
The letter F is placed in front of a plane mirror:
What is the name of the phenomenon involved?
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?
State the two kinds of spherical mirror and distinguish them with the aid of proper diagrams.
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
State the kind of mirror used
(a) By a dentist,
(b) As a search-light reflector.
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.
Answer the following question:
Distinguish between the convex mirror and the concave mirror.
An object 5 cm high forms a virtual image of 1.25 cm high, when placed in front of a convex mirror at a distance of 24 cm. Calculate:
- the position of the image
- the focal length of the convex mirror.
Select the correct option:
A concave mirror is made by cutting a portion of a hollow glass sphere of radius 30 cm. The focal length of the concave mirror is:
Define the term principal focus in case of convex mirror. Draw a convex mirror and show its principal focus and focal length clearly.
What is the relation between focal length and radius of curvature of a concave mirror?
Find the height of the image of a body of height 1.5m in a mirror with a magnification of 1.5.
If the focal length of a spherical mirror is 10 cm, what is the value of its radius of curvature?
Name the type of mirror used in the following situation:
Solar furnace
Support your answer with reason.
In normal adjustment, for a refracting telescope, the distance between objective and eye piece is 30 cm. The focal length of the objective, when the angular magnification of the telescope is 2, will be ______.
