Convex / converging lenses and ray diagrams explained: from fizzics.org

Рет қаралды 131,841

9 жыл бұрын

Notes to support this video lesson are here:
www.fizzics.org/drawing-ray-d...
With many other topics here:
www.fizzics.org/fizzics-guide/
Similar video lessons on diverging lens and curved mirrors are here:
• Concave mirrors and ra... for concave mirror
• Convex mirrors and ray... for convex mirror
• Concave / diverging le... for diverging lens
Explaining how to draw ray diagrams for a convex / converging lens used as a projector and as a magnifying glass. Combining demonstrations with a real lens and laser streaks though the centre and edges to show why only certain "rays" are traced through on the diagram.

Пікірлер: 130

@xanderalxandro6823 3 жыл бұрын

The demonstrations using graph paper really help in understanding the math. Everything just falls into place visually. Thanks.

@fizzicsorg 3 жыл бұрын

Good to read, thank you

@AHMADZABIR 7 жыл бұрын

The best explanation available on youtube

@fizzicsorg 7 жыл бұрын

Thank you. It's great that you found it useful

@vijenderparshad8814 6 жыл бұрын

AHMAD ZABIR u r frm Pakistan??

@albert3274 3 жыл бұрын

refreshed after 20 years. Thank you for your video.

@fizzicsorg 2 жыл бұрын

You are welcome!

@Matescium 5 жыл бұрын

Your explanation is easy to understand. Thanks for making it easy.

@fizzicsorg 5 жыл бұрын

Glad you found it useful, thanks for your comment

@katesleath2207 7 жыл бұрын

I am a science teacher and I have to say this is one of the best videos I have found. Just at the level I need to show to my class, goes at a good pace and clears up any misconceptions as you go. I love the bit with the lasers. I am going to put together a little questions sheet to go with it. Thank you!!!

@fizzicsorg 7 жыл бұрын

Thank you for the comment. The bit with lasers is easily replicated with a cheap pen laser and either chalk dust, smoke or a fine water spray

@delishamaharaj5303 5 жыл бұрын

you are the bomb.... i wish you were my teacher 38 years ago... keep up the great work sir

@fizzicsorg 5 жыл бұрын

That's a great comment thank you.

@yaswanthsai4788 4 жыл бұрын

You made it very easy to understand sir

@santoshsathe1969 7 жыл бұрын

best activity which clear all concept about image formation, lot of Thanks.

@fizzicsorg 7 жыл бұрын

Thank you for your comment

@kayaakroyd7179 7 жыл бұрын

this is the best video explaining this. Thanks for info

@fizzicsorg 7 жыл бұрын

No problem, glad that it was useful.

@pallavisingh5610 6 жыл бұрын

kaya akroyd fvdbgcccfggd are

@astraea1353 7 жыл бұрын

This is terrific! Very well said and everything is clear!

@fizzicsorg 7 жыл бұрын

Thank uou

@definitelyuncertain 8 жыл бұрын

Thank you for making this video. It was way easier to follow than my physics class!

@fizzicsorg 8 жыл бұрын

+lilt0mb0y Thank you

@mathphilic9832 7 жыл бұрын

I found this demonstration very useful. Thanks a lot!

@fizzicsorg 7 жыл бұрын

Good. Thanks for the comment

@kaavyashukla8911 8 жыл бұрын

Thx a lot Mr. Roger This video has been really helpful :)

@yammay 5 жыл бұрын

Thank you! This was very clear, and I finally understand everything about the unit we're currently on in class.

@fizzicsorg 5 жыл бұрын

That's good to hear. Thank you for your comment.

@GurunathHari 8 жыл бұрын

Hi Roger, loved your explanations. Glad i came upon your page as i was looking for resources to help my son who is prepping for his 'O' levels. i can confess and let you know that all thru my study of physics i could only imagine the concept of ray diagrams. By using lasers you made it so tellingly obvious. Beautiful. Thank you and keep up the good work!

@fizzicsorg 8 жыл бұрын

+Gurunath Hari Thank you. Your son is fortunate to have help. I hope all goes well.

@jogenderchauhan8894 5 жыл бұрын

Nice explanation using laisser light

@fizzicsorg 5 жыл бұрын

Thank you. I hope it was useful

@zamrasul2628 7 жыл бұрын

thanks... for clearing my concept..

@himanshukondal9394 7 жыл бұрын

what a incredible work man

@fizzicsorg 7 жыл бұрын

Thank you. Maybe "incredible" is a bit over the top but thank you anyway!

@rakeshsrivastava9495 5 жыл бұрын

Amazing my concepts are clear now Sir! Thank you very much for your help.

@fizzicsorg 5 жыл бұрын

that's good to hear, thanks for the comment.

@kartikeyasharma1444 8 жыл бұрын

Very well explained! Thank you sir...👍

@fizzicsorg 8 жыл бұрын

Thank you. I hope your studies go well.

@rickyram5246 8 жыл бұрын

very well said roger

@muraleedharanm4305 6 жыл бұрын

Thanks it's better than my physics class.

@fizzicsorg 6 жыл бұрын

Great that it was useful to you. There is another on diverging lenses and one each on concave and convex mirrors.

@saltypeanut4157 7 жыл бұрын

awesome video man very very informative👍

@fizzicsorg 7 жыл бұрын

Thanks. Also one on diverging lenses here kzfaq.info/get/bejne/grN_dLmb2-Cbc30.html

@saltypeanut4157 7 жыл бұрын

Hey man I appreciate your work keep it up

@bensonenweriem5583 Ай бұрын

Nice job I have learned alot

@DarwinDunks 7 жыл бұрын

nice !! thanks !

@user-sw1ev1ih1p 5 жыл бұрын

Too much nice video sir, easily under standing to draw images

@fizzicsorg 5 жыл бұрын

Thank you, it is good that you found it useful.

@kunalsingh-pp8gp 7 жыл бұрын

Nice video

@nann_u_bhatt 5 жыл бұрын

😊Thank you so much you clear my doubts..😃

@fizzicsorg 5 жыл бұрын

Good, thank you for your comment.

@abasmaye8957 9 жыл бұрын

Fantastic.

@ckbabu2367 6 жыл бұрын

nice explanation ! thank you.

@fizzicsorg 6 жыл бұрын

thanks for the comment

@ckbabu2367 6 жыл бұрын

You are great I passed in physics because of you

@zenahossam5221 6 жыл бұрын

Thank youuu expert

@AbuSayed-er9vs 5 жыл бұрын

Excellent!!!

@fizzicsorg 5 жыл бұрын

Thank you.

@devanshgaur1692 5 жыл бұрын

Which pen are you using Please answer

@willeett 7 жыл бұрын

So what is the magnification in the last image??

@gloobark 4 жыл бұрын

@arvindnagnathraophad9056 5 жыл бұрын

Thanks for make this video

@fizzicsorg 5 жыл бұрын

Good to know it was useful. Thanks for the comment.

@srinjiniray5744 4 жыл бұрын

hi, very helpful video. do you have any video on fourier optics.

@fizzicsorg 4 жыл бұрын

Hi, thanks for the feedback but sorry nothing specifically on Fourier. Several others on ray diagrams, that is for diverging lens and curved mirrors.

@gedghgerr3724 8 жыл бұрын

What's that white in hand?

@rizwanahmed2423 5 жыл бұрын

Excellent!👏👏👏👏👏👏👏

@fizzicsorg 5 жыл бұрын

Thank you

@niveyoga3242 6 жыл бұрын

Good job!

@fizzicsorg 6 жыл бұрын

Thank you.

@MichaelCurrie 2 жыл бұрын

9:11 I wonder if this setup could be used to simulate depth in an image, to create virtual reality?

@fizzicsorg 2 жыл бұрын

Possibly but not sure how.

@ayaa5630 7 жыл бұрын

Do you make videos about force mass and acceleration? This was very useful btw

@fizzicsorg 7 жыл бұрын

Not on youtube. There are a few force and motion videos in the playlist here: kzfaq.info/sun/PLLKB_7Zd6lePXgOD1QBgl3d6D14x6mc_p

@saffansamnani6943 3 жыл бұрын

sir so why when we move the magnifying glass away from the object(beyond the focal point) and watch the image from the other side, it doesn't appear inverted??

@fizzicsorg 3 жыл бұрын

It will appear the tight way up and blurred if your eye is very close to the lens but sharp and inverted if you move back a little

@hrmeet0509 8 жыл бұрын

HI, video was good but can anybody tell me what is white powder in the hand

@fizzicsorg 8 жыл бұрын

+Sahil Oberoi Just talcum powder but you can also use a fine spray of water from an atomiser

@hrmeet0509 8 жыл бұрын

+Roger Linsell thanks

@abhiaagarwal 8 жыл бұрын

Thanks for an amazing video! If you could take time out to just answer some doubts I had: 1) When we are using the projector arrangement to enlarge the image: How do we calculate at what point the image will be sharp and focused? What should be the ideal distance of the lens from the object? 2) All convex lenses are magnifying glasses right? When I look through my magnifying glass at something 2-3ft away or further, why is it blur? Why doesn't the same blur happen for my spectacles? Thanks !!

@fizzicsorg 8 жыл бұрын

+abhishek agarwal Hi The distances you ask about depend on the distance from the object you are projecting to the lens and upon the focal length of the lens. ou can calculate this using the lens equation or you can draw a ray diagram to scale. Two points on the second question. Are you sure your spectacles are converging lenses, if you are short sighted they will not be. In any case you are using two lenses, the spectacle lens and the one in your eye. The one in your eye is flexible and automatically adjusts to focus the light. See how the eye works here: kzfaq.info/get/bejne/mcmAf5eir92UaZc.html

@somrajkafle9176 3 жыл бұрын

Thank you

@fizzicsorg 3 жыл бұрын

Good that it was useful

@nikkminds5776 6 жыл бұрын

very nice

@fizzicsorg 6 жыл бұрын

Thank you. Glad it was useful. This is one of five videos on lenses and mirrors, the others may also be useful. See my channel playlists

@odal6770 Жыл бұрын

the object is on the table, as is the lens, and also the screen. That does not correspond to your drawing @05:33 , does it?

@odal6770 Жыл бұрын

I find the absence of a reaction from you rather puzzling. Either your drawings do not correspond to reality, or they do. In that case you should be able to show it.

@jessieaselviasokan8336 7 жыл бұрын

thanks

@srinivaslakkimsetty8176 7 жыл бұрын

thank you

@fizzicsorg 7 жыл бұрын

Thanks, it is good to know that it was useful.

@blackstargaming7771 5 жыл бұрын

Thanks sir I read in 10th class. You clear my all doubts ✌✌✌✌

@fizzicsorg 5 жыл бұрын

thank you for your comment.

@omark1120 6 жыл бұрын

Thanks sir

@fizzicsorg 6 жыл бұрын

Glad it was useful. See other mirror and lens videos on my channel.

@ashokrana4590 5 жыл бұрын

So thanks

@fizzicsorg 5 жыл бұрын

Good that it was useful

@yashnaryani 8 жыл бұрын

the video was nice but u used that talcum powder .how does it shown the rays???

@hamiltonianpathondodecahed5236 5 жыл бұрын

Tyndall effect

@hamiltonianpathondodecahed5236 5 жыл бұрын

Tyndall effect. He could also had used smoke

@Hibiol-of-my-decay 7 жыл бұрын

thank you!

@rohanselson5361 8 жыл бұрын

good one sir!Q!Q!Qqqqqqqq love it

@kuntaldutta2558 7 жыл бұрын

great

@fizzicsorg 7 жыл бұрын

Thank you. Glad it was useful.

@saipraneshs8897 6 жыл бұрын

Nice

@fizzicsorg 6 жыл бұрын

Thank you

@maheshjaiswal9712 6 жыл бұрын

Nice ji

@fizzicsorg 6 жыл бұрын

thank you

@pourtgal8172 6 жыл бұрын

yr powder kya h

@odal6770 Жыл бұрын

Apparently the drawings only work if the arrow is located on the principal axis.

@fizzicsorg Жыл бұрын

yes

@deepalishenoy9180 6 жыл бұрын

Y talcum is used

@fizzicsorg 6 жыл бұрын

Because the particles of talcum reflect the laser light well.

@ekjotsingh4335 5 жыл бұрын

Intelligent hard

@kelashchandra1088 6 жыл бұрын

jay

@palojujaisrirampssppp590 Жыл бұрын

🙏🌹🇮🇳 PSSPPP 🇮🇳 PALOJU JAI SRIRAM 🇮🇳🌹🙏

@The70ny 8 жыл бұрын

Sir my respects, i find so useful your video, but i have some deep questions, can you give me an email to contact to you?.

@fizzicsorg 8 жыл бұрын

try the website

@user-sw1ev1ih1p 5 жыл бұрын

Send useful videos just like releted to light

@matthewarmour9105 8 жыл бұрын

really simple then suddenly confusing. Suppose you put your eye... but where was it before in this model? Why here looking at the graph paper! The viewer suddenly becomes viewed. So your model world is inconsistent. You magic in another lense to explain what effectively is a refraction angle which you neglected to explain earlier. So the viewer is imagining looking at an imaginary eye which wasn't required before. It's like reading a old Greek math proof. Just draw triangles please!

@Akashascosset 6 жыл бұрын

How are you talking without an American accent yet you're using a ruler with only inches on it?!? What an atrocity! Also, would've been helpful when you moved the magnifying glass closer to the flashlight that your drawings showed only a difference in the lens moving, rather than keeping the lens stationary and changing the position and the scale of the rest of the scene. I understand your image would've been very large, but I think there's more important parts to highlight Very helpful video though. Thank you

@fizzicsorg 6 жыл бұрын

The ruler is metric on the reverse, as is common with many British instruments. You may be right about the lens movement, I'm afraid it is hard to think of everything in advance.