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If the Focal Length of a Convex Mirror is 25 Cm, What is Its Radius of Curvature? - Science

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प्रश्न

If the focal length of a convex mirror is 25 cm, what is its radius of curvature?

उत्तर

The focal length of a convex mirror is 25 cm, i.e. 'f' is 25 cm.

So, the radius of curvature of the convex mirror, 

`R`=`2f=2xx25=500cm`

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अध्याय 4: Reflection of Light - Exercise 2 [पृष्ठ १७८]

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लखमीर सिंग Physics (Science) [English] Class 10
अध्याय 4 Reflection of Light
Exercise 2 | Q 4 | पृष्ठ १७८

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संबंधित प्रश्न

To determine the approximate value of the focal length of a given concave mirror, you focus the image of a distant object formed by the mirror on a screen. The image obtained on the serene, as compared to the object is always:

(a) Laterally inverted and diminished

(b) Inverted and diminished

(c) Erect and diminished

(d) Erect and highly diminished


ill in the following blank with suitable word:

 For a convex mirror, parallel rays of light appear to diverge from a point called the ......... .


With the help of a ray diagram, determine the position, nature and size of the image formed of an object placed at the centre of curvature of a concave mirror. 


A concave mirror has a focal length of 4 cm and an object 2 cm tall is placed 9 cm away from it. Find the nature, position and size of the image formed. 


What type of image/images are formed by: 

 a convex mirror? 

 


An object is placed 15 cm from (a) a converging mirror, and (b) a diverging mirror, of radius of curvature 20 cm. Calculate the image position and magnification in each case. 


With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram.


A student obtained a sharp inverted image of a distant tree on a screen placed in front of the concave mirror. He then removed the screen and tried to look into the mirror. He would now see

(A) a very blurred image on the wall opposite to the mirror

(B) an erect and magnified image of the tree in the mirror

(C) no image as the screen has been removed

(D) a highly diminished inverted image of the tree at the focus of the mirror.


The mirror having reflection surface curved outward ______.


In the headlights of motor vehicles, ______ mirrors are used as reflectors.


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