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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
Explain the following term related to spherical lenses: focal length
Which type of mirror can form a real image?
The shiny outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror:
- What will be the focal length of this mirror?
- Which type of spherical mirror will it provide?
- State whether this spherical mirror will diverge or converge light rays.
A 2.0 cm tall object is placed 40 cm from a diverging lens of focal length 15 cm. Find the position and size of the image.
A student obtained a sharp image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting better value of focal length of the mirror, the subject teacher suggested him for focusing a well illuminated distant object. What should the student do?
(A) He should move the mirror away from the screen.
(B) He should move the mirror slightly towards the screen.
(C) He should move the mirror as well as the screen towards the newly selected object.
(D) He should move only the screen towards the newly selected object.
Name the two kinds of spherical mirrors and distinguish between them.
Define the terms pole, principal axis and centre of curvature with reference to a spherical mirror.
In each case (a) and (b), draw reflected rays for the given incident rays and mark focus by the symbol F.
Upto what maximum distance from a concave mirror, the image can be obtained? What will be the location of object for it?
An object of length 4 cm is placed in front of a concave mirror at distance 30 cm. The focal length of mirror is 15 cm.
- Where will the image form?
- What will be the length of image?
A straight stick partly dipped in water obliquely appears to be bent at the surface of the water.
Select the correct option:
Looking into a mirror one finds her image diminished, the mirror is:
Define the following term in relation to concave mirror.
Center of curvature
What is a mirror formula?
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.
How tall does a mirror have to be to fit an entire person’s body?
