what is mirror formula ??
Uses of plane mirrors
Uses of concave mirror
Uses of convex mirrors
Identification of mirrors
Answers
Answered by
18
Hey I'm MrMysterious
The Answer of your Question is ->
≥ An equation which gives the relation between focal length(f) , object distance(u) and image distance (v) is called
Mirror formula it is given by : 1/f = 1/u + 1/v
Linear Magnification: The ratio of height of image to the height of object is known as linear magnification.
Magnification = height of image/ height of object
Where hi = Height of image
and ho = Height of object
It is also defined as the ratio of the image distance to the object distance , with a minus sign.
Thus,
Magnification, m = -v/u
Where v = inage distance, u = object distance
i
IMPORTANT POINTS:
1. Object distance (u) is always negative.
2. If v is positive, then the image will be virtual and erect. But if v is negative , then image is real and inverted.
3. For convex mirror, v is always positive because convex mirror always form virtual and erect image and for concave mirror, v is only positive when the object is placed between pole and principal focus. Otherwise v is negative.
4. If value if linear magnification 'm' is negative then the image is real and inverted.
5. If value of 'm' >1 , then image is enlarged. If value of 'm' = 1 , then image is of same size as that of object. If value of 'm'<1 then image is diminished.
6. Convex mirror always gives a diminished virtual image but concave mirror gives a magnified virtual image.
7. Magnification of plane mirror is always +1 because plane mirror always form virtual, erect and same size image.
≥ USES OF PLANE MIRROR:
⚫Plane mirrors are generally used as a looking glass in daily life.
⚫In optical instruments such as periscope, kaleidoscope, etc.,plane mirrors are used as reflectors.
⚫Plane mirrors are also used at the blind turns on the road to guide drivers.
≥ USES OF CONCAVE MIRROR:
⚫Concave mirrors are used by doctors to focus a parallel beam of light on the patient's organs like teeth, throat , ear etc , for the examination of these parts.
⚫We know that when an object is placed between the pole and the focus of concave mirror , a magnified, erect and virtual image is obtained. This property of concave mirror is utilised for using them as shaving mirror.
⚫ Concave mirrors are also used as reflectors in headlight of automobiles and in search-lights which are meant for throwing light to large distances. The sources of light is placed just at the focus of the concave mirror and a parallel beam of light is obtained by reflection.
⚫Large concave mirrors are used to concentrate sunlight to produce heat in solar furnaces.
≥ USES OF CONVEX MIRRORS:
⚫As a rear view mirror in vehicles : Convex mirrors are used as rear view mirrors in vehicles ( ear,trucks, buses , etc.) to see traffic at the backside. This due to the following reasons.
⚫Convex mirror always form an erect and diminished image.
⚫They have a wider field of view as they are curved outwards.
For this purpose , plane mirrors may also be used. But a convex mirror is preferred because the field of view is wider than that of a plane mirror.
⚫As a reflector in street lamps : This light incident on the lamp is reflected by the convex mirror and reflected light spreads in the form of a divergent beam. Therefore, light spreads over a larger area.
≥ IDENTIFICATION OF MIRRORS
Observing the image produced by a mirror at different positions of object its nature can be identified.
✳ If the image formed by the mirror is of same size of object for different positions of object then the mirror is plane mirror.
✳ If the image formed by thr mirror is diminished for all positions of object then mirror is convex mirror.
✳ If the image formed behind the mirror is longer than the object then the mirror is concave mirror.
✴Brainly Benefactor✴
From MrMysterious
The Answer of your Question is ->
≥ An equation which gives the relation between focal length(f) , object distance(u) and image distance (v) is called
Mirror formula it is given by : 1/f = 1/u + 1/v
Linear Magnification: The ratio of height of image to the height of object is known as linear magnification.
Magnification = height of image/ height of object
Where hi = Height of image
and ho = Height of object
It is also defined as the ratio of the image distance to the object distance , with a minus sign.
Thus,
Magnification, m = -v/u
Where v = inage distance, u = object distance
i
IMPORTANT POINTS:
1. Object distance (u) is always negative.
2. If v is positive, then the image will be virtual and erect. But if v is negative , then image is real and inverted.
3. For convex mirror, v is always positive because convex mirror always form virtual and erect image and for concave mirror, v is only positive when the object is placed between pole and principal focus. Otherwise v is negative.
4. If value if linear magnification 'm' is negative then the image is real and inverted.
5. If value of 'm' >1 , then image is enlarged. If value of 'm' = 1 , then image is of same size as that of object. If value of 'm'<1 then image is diminished.
6. Convex mirror always gives a diminished virtual image but concave mirror gives a magnified virtual image.
7. Magnification of plane mirror is always +1 because plane mirror always form virtual, erect and same size image.
≥ USES OF PLANE MIRROR:
⚫Plane mirrors are generally used as a looking glass in daily life.
⚫In optical instruments such as periscope, kaleidoscope, etc.,plane mirrors are used as reflectors.
⚫Plane mirrors are also used at the blind turns on the road to guide drivers.
≥ USES OF CONCAVE MIRROR:
⚫Concave mirrors are used by doctors to focus a parallel beam of light on the patient's organs like teeth, throat , ear etc , for the examination of these parts.
⚫We know that when an object is placed between the pole and the focus of concave mirror , a magnified, erect and virtual image is obtained. This property of concave mirror is utilised for using them as shaving mirror.
⚫ Concave mirrors are also used as reflectors in headlight of automobiles and in search-lights which are meant for throwing light to large distances. The sources of light is placed just at the focus of the concave mirror and a parallel beam of light is obtained by reflection.
⚫Large concave mirrors are used to concentrate sunlight to produce heat in solar furnaces.
≥ USES OF CONVEX MIRRORS:
⚫As a rear view mirror in vehicles : Convex mirrors are used as rear view mirrors in vehicles ( ear,trucks, buses , etc.) to see traffic at the backside. This due to the following reasons.
⚫Convex mirror always form an erect and diminished image.
⚫They have a wider field of view as they are curved outwards.
For this purpose , plane mirrors may also be used. But a convex mirror is preferred because the field of view is wider than that of a plane mirror.
⚫As a reflector in street lamps : This light incident on the lamp is reflected by the convex mirror and reflected light spreads in the form of a divergent beam. Therefore, light spreads over a larger area.
≥ IDENTIFICATION OF MIRRORS
Observing the image produced by a mirror at different positions of object its nature can be identified.
✳ If the image formed by the mirror is of same size of object for different positions of object then the mirror is plane mirror.
✳ If the image formed by thr mirror is diminished for all positions of object then mirror is convex mirror.
✳ If the image formed behind the mirror is longer than the object then the mirror is concave mirror.
✴Brainly Benefactor✴
From MrMysterious
TanishaGoyal:
Thank you so much
Very pleasent answer
welcome
Awesome answer ^^
Answered by
5
Explanation:
A mirror formula can be defined as the formulawhich gives the relationship between the distance of object 'u', the distance of image 'v', and the focal length of the mirror 'f'.
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