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प्रश्न
Name the spherical mirror which has:
(a) virtual principal focus.
(b) real principal focus.
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उत्तर
The spherical mirror which has
(a) a virtual principal focus is a convex mirror
(b) a real principal focus is a concave mirror
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संबंधित प्रश्न
A student focused the Sun rays using an optical device 'X' on a screen S as shown.
From this it may be concluded that the device 'X' is a (select the correct option)
(A) Convex lens of focal length 10 cm.
(B) Convex lens of radius of curvature 20 cm.
(C) Convex lens of focal length 20 cm.
(D) Concave mirror of focal length 20 cm.
Define the following term in the context of spherical mirrors:- Pole
What type of image is formed:
in a plane mirror?
Write the formula for a lens connecting image distance (v), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula?
What is a spherical mirror?
State the two kinds of spherical mirror and distinguish them with the aid of proper diagrams.
Name the kind of mirror used to obtain:
A virtual and diminished image
The focal length of a concave mirror is 10 cm. Find its radius of curvature.
An object 5 cm high is placed at a distance 60 cm in front of a concave mirror of focal length 10 cm. Find the position and size of the image.
Select the correct option:
Which mirror is used in periscope?
Define the term Normal.
The following Figure shows a concave mirror MM' on which a ray of light incident from a point P gets reflected to meet the principle axis at O.
(a) Find, by construction, the position of the centre of curvature of the concave mirror.
(b) Write down the value for the radius of curvature of the mirror.
(c) Calculate the focal length of the mirror.
(d ) Which relation is used in deducing the focal length from the radius of curvature?
Which of the following has curved reflecting surface?
The distance from the pole to the focus is called ______.
In torches, search lights and headlights of vehicles the bulb is placed ______.
If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens?
