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प्रश्न
Write the mirror formula. Give the meaning of each symbol which occurs in it.
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उत्तर
The formula for a mirror is:
`1/v+1/u=1/f`
where, v = distance of image from mirror
u = distance of object from mirror
f = focal length of the mirror
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संबंधित प्रश्न
Give one use each of a concave and a convex mirror.
A virtual image larger than the object can be produced by a ______.
Name the spherical mirror which has:
(a) virtual principal focus.
(b) real principal focus.
The shiny outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror:
Which type of spherical mirror will it provide?
A lens forms a real image 3 cm high of an object 1 cm high. If the separation of object and image is 15 cm, find the focal length of the lens.
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.
Draw separate diagram for the formation of virtual image of an object by a concave mirror.
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
For what position of object, the image formed by a concave mirror is magnified and erect?
Name the kind of mirror used to obtain:
A virtual and diminished image
How will you distinguish between a plane mirror, a concave mirror and a convex mirror, without touching them?
A straight stick partly dipped in water obliquely appears to be bent at the surface of the water.
Define the term Centre of curvature.
A ray of light is incident towards a plane mirror at an angle of 30° with the mirror surface. What will be the angle of reflection?
