Curved Mirrors1 - the concave mirror

[gvpism]

thank u cyberphysics it was helpful

[Cyberphysics]

To get the effect you require you would have to use a point source of light in a darkened room and have the light source move along the principle axis.

[TheDevilvivek]

if real images formed by concave mirrors are located on front of the mirror, why do we see the image on the mirror itself, as if it were located behind the mirror?

[Cyberphysics]

@TheDevilvivek When you look into a concave mirror you are seeing an image of the points of many objects at many distances - this is true even for a even a small object - in a darkened room. The mirror ray diagram is for a 'point' on an object close to the principal axis. You are mistakenly thinking that it is for all points.

[TheDevilvivek]

when i put my head beyond c (concave mirror) i saw inverted and diminished image behind the mirror but in concave mirror when the object is placed beyond c image is formed between centre of curvature and focus,please help me out

[Cyberphysics]

Look at the diagram :cyberphysics.co.uk/graphics/d­iagrams/light/mirrors/concave_­ray5.gif

It shows you that the image is formed in the same place as the object - it is real and inverted.

[TheDevilvivek]

i am having a problem , when i see the ray diagram of concave mirror ( except in which object is placed between focus and vertex)all 5 ray diagrams i see image is formed below object . if object is placed at c image is also placed at see c this mean image is formed in surrounding not in mirror , please please help me out

[Cyberphysics]

If you wanted to draw the mirror edge with a compass you would need to put your compas point on 'C' to draw the curve.

[TheDevilvivek]

image is always formed behind the mirror not in surrounding but you have showed image in surrounding

[Cyberphysics]

@TheDevilvivek see cyberphysics.co.uk/topics/ligh­t/concave_mirror_construct.htm - that explains how to construct images in a curved mirror.

[TheDevilvivek]

can you please explain me centre of curvature

[Cyberphysics]

@TheDevilvivek Concave mirrors can be thought of as being made from the silvered inside of a sphere. If we took a sphere that was silvered on the inside and chopped off a section of it we would have a concave mirror.The line passing through the center of the sphere and attaching to the mirror in the exact center of the mirror is the principal axis. The point in the center of the sphere from which the mirror was sliced is known as the center of curvature and is denoted by the letter C .

[TheDevilvivek]

@Cyberphysics it is necessesary that mirror should be chopped from the centre

[Cyberphysics]

@TheDevilvivek If you took a silver ball and sliced off a small part that part would not have the centre of the sphere within it unless your slice was bigger than half of the ball - look at the page and think about it.

[TheDevilvivek]

@Cyberphysics if i have sliced more than half of ball then how can i see centre .

[Cyberphysics]

@TheDevilvivek You would not make a concave mirror in that way - you would always have a small section of the sphere... not even a hemisphere.

[TheDevilvivek]

@Cyberphysics if i take two spherical ball, one big and one small ,if a chop 2 cm from the big mirror and 2 cm from small mirror they will have different centre of curvature ,yes or not.

[Cyberphysics]

@TheDevilvivek Yes - the distance from the mirror to C is the radius of the ball the mirror is cut from - therefore if the ball is bigger the distance VC (distance from the mirror to point C) will be bigger.

[TheDevilvivek]

@TheDevilvivek i am saying that why you say centre of hollow glass sphere from which mirror was chopped

[TheDevilvivek]

@Cyberphysics i am not able to understand this " point in the centre of sphere"

[TheDevilvivek]

@Cyberphysics The point in the center of the sphere from which the mirror was sliced is known as the center of curvature and is denoted by the letter C .you are talking about concave mirror or hollow glass sphere from which it was cut

[recklessandlovely]

wonderful video, but i was wondering how would you draw it, if the object is on c? cause like if i have to draw a ray going through c to the mirror how does that work ?

[Shogun1289]

very helpful video. thanks!

[Cyberphysics]

@Shogun1289 My pleasure!

[ckazlaine]

i really like this topic :)

[frozenlicks]

thanks..ma'am..i was having a hard time on listening to my teacher when she was teaching this...

[Cyberphysics]

@frozenlicks Happy to be of use!

[itsherlife]

this is the most annoying voice i've ever heard. are you like, 99 years old...

[LAsalsero12]

Thank you for posting. I love the video. Extremely helpful.

[Soloroxon]

Thank for the video. The chart really helped.

[bhairav23]

thank you..

you should teach our university lecturer how to teach :D

[TheR33l]

Can I ask, what causes us to see the 'real' image? Is it the fact that multiple photons meet at the same time and amplify the lights effect enough that our eyes recognize it in that area?

[Cyberphysics]

@TheR33l - Rays of light (or beams of photons if you like!) going from the real image point into our eyes are all coming from the same point - they are focussed onto one point on the retina - firing only a couple of receptor cells in a tiny area - and the brain then works out where they come from and our perception is of an image at that point. That is happening for millions of points from the object (which in this case is a real image) - so we build up a full picture.

[XDAdzXD]

made me sleep

[Cyberphysics]

Perhaps I should patent it...

[mynameisnk]

yo i hate the accent lol

[Cyberphysics]

I'm not enamored with yours... c'est la vie!

[jimmynguyen1993]

very helpful

[Hiraiftikhar1]

well explained!