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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.
संबंधित प्रश्न
An image that cannot be obtained on a screen is called ______.
A ray of light is incident normally on a plane mirror. What will be the
angle of reflection?
Complete the following sentence:
All the distances are measured from the .......... of a spherical mirror.
- A small object is placed 150 mm away from a diverging lens of focal length 100 mm.
- Copy the figure below and draw rays to show how an image is formed by the lens.
- Calculate the distance of the image from the lens by using the lens formula.
- Copy the figure below and draw rays to show how an image is formed by the lens.
- The diverging lens in part (a) is replaced by a converging lens also of focal length 100 mm. The object remains in the same position and an image is formed by the converging lens. Compare two properties of this image with those of the image formed by the diverging lens in part (a).
Write true or false
A virtual image formed by a spherical mirror is always erect and situated behind the mirror.
What do you understand by the focus and focal length of a spherical mirror? Show them on the separate diagrams for each of a concave mirror and a convex mirror.
State the number of images of an object placed between two mirrors, formed in each case when mirrors are inclined to each other at (a) 90°, and (b) 60°.
In each case (a) and (b), draw reflected rays for the given incident rays and mark focus by the symbol F.
Discuss the position and nature of image formed by a convex mirror when an object is moved from infinity towards the pole of mirror.
How will you distinguish between a plane mirror, a concave mirror and a convex mirror, without touching them?
Upto what maximum distance from the pole the image in a convex mirror can be obtained? what will be the location of object then ?
A real and enlarged image can be obtained by using a
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.
Select the correct option:
Looking into a mirror one finds her image diminished, the mirror is:
A student traces the path of a ray of light passing through a rectangular slab.
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For measuring the angle of incidence, he must position the protractor in the manner shown in the figure:
A shopkeeper wanted to fix a mirror which will give a maximum view of his shop. What type of mirror should he use? Give reason.
