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प्रश्न
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.
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उत्तर
a. Given: Radius (r) = 50 cm
f = `r/2`
f = `50/2`
f = 25 cm
b. The convex mirror is the spherical mirror provided by it.
c. It will diverge light rays.
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संबंधित प्रश्न
A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected?
What is a virtual image?
A diverging lens is used in ______.
State the two kinds of spherical mirror and distinguish them with the aid of proper diagrams.
State the kind of mirror used
(a) by a dentist, and
(b) as a street light reflector.
In each case (a) and (b), draw reflected rays for the given incident rays and mark focus by the symbol F.
Write two more characteristics of the image.
Name the kind of mirror used to obtain :
A real and enlarged image
Name the kind of mirror used to obtain:
A real and diminished image.
Upto what maximum distance from a concave mirror, the image can be obtained? What will be the location of object for it?
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.
Aperture
Define the term Principle focus.
Name the type of mirror used in the following situation:
Solar furnace
Support your answer with reason.
