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प्रश्न
A diverging lens is used in ______.
विकल्प
a magnifying glass
a car to see objects on rear side
spectacles for the correction of short sight
a simple camera
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उत्तर
A diverging lens is used in spectacles for the correction of short sight.
संबंधित प्रश्न
A ray of light strikes a plane mirror at an angle of 40° to the mirror surface. What will be the angle of reflection?
What kind of mirror is required for obtaining a virtual image of the same size as the object?
Complete the following sentence:
All the distances are measured from the .......... of a spherical mirror.
What do you mean by the term dispersion?
How is a spherical mirror used to diverge a beam of light from a point? Name the type of mirror used.
If a spherical mirror breaks, what type of mirrors are the individual pieces?
Three mirrors are created from a single sphere. Which of the following - pole, centre of curvature, radius of curvature, principal axis - will be common to them and which will not be common?
Name the two kinds of spherical mirrors and distinguish between them.
How is the focal length of a spherical mirror related to its radius of curvature?
(a) When a concave mirror is used as a shaving mirror, where is the person's face in relation to the focus of mirror?
(b) State three characteristics of the image seen in part (a).
State the kind of mirror used
(a) By a dentist,
(b) As a search-light reflector.
What do you understand by the term real image?
Define the term Focus of a concave mirror.
A concave mirror can be used to produce a parallel beam of light. Draw a ray to illustrate this.
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?
The distance from the pole to the focus is called ______.
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?
