Mirror equation example problems | Geometric optics | Physics | Khan Academy

[@bbcclub4843]

Thanks helped a lot for my optics quiz 😀

[@Maniii_o7144]

Thank u so much 🙏

[@smangagiven259]

wow thank you😁

[@theturniptress805]

I have always been taught that whatever is on the left side is negative, and whatever is on the right side is positive( in India). Whereas here in this video lesson , the convention is that whatever is on the left is positive,and whatever is on the right is negative. Just different conventions, I guess.

[@sharathbhat8520]

Even me to, so I was confused

[@enderredacted112]

that makes things so much worse, i cant decide the magnification sign at all

[@adelesabrina2816]

Finnally I get~~~~~. Thankyou :)

[@manndaab]

life saver thank u

[@Photiic]

Ayo who else got a optics test coming up 😶

[@erusia8777]

Ah yes! My savior! -someone who did not listen to a thing the teacher said

[@09233kkkk]

Oh God this sign conventions are killing me Everywhere according new or cartesian convention Focal length: Concave is negative Convex is positive But old sign convention Focal length: concave is positive and Convex is negative Which one is correct ??

[@reginamullerova3644]

Super videos, can I ask, which app do you use to draw?

[@fredbrucker121]

Following. . . I'd like to know, too.

[@Ak5h1t]

Following.

[@boohoo716]

I get everything about mirror equations and I can successfully solve all the problems, but I can never understand why the term "behind" the mirror is used. Even in other videos I've watched they always say "the image is behind the mirror" when there is nothing ever behind the mirror?????

[@itsnotteresa]

It just APPEARS to be formed behind the mirror. For example in the case of a plane mirror, the distance between you and the image is equidistant...the image is formed behind the mirror. It's not on the mirror. If you "re-trace" the incident rays it forms beyond the mirror. I hope this is understandable, and Ik that it's 9 months late 😂

[@ravpqyi]

hope this video can help me;-;

[@jareddevedelicana930]

I think height of the image in example 1 should be 1 and a half larger than the object, you draw somewhat 0.5 the height of the object.

[@jamesdarylestrera1843]

What if both the ho and hi are missing?

[@papupradhan9920]

I want plant taxonomy

[@kpdolan7932]

It's so hardddd I have exam today and I still don't get it I badly just wanna die 😭😭

[@svnjm]

(1) 😭😭😭

[@leilathomas2536]

sorry if i'm writing this 3 years later but I hope you did well on your exam!!!!

[@duppalajagannadharao8174]

How object distance can be positive?

[@xxmemestar69xx82]

Duppala Jagannadha Rao The distance object is always positive no mater what

[@NobuNobuSimp]

It's ways positive since it's never coming towards the back side of the mirror. If an image is behind the mirror then it's virtual (minus)

[@rocknrolla1211]

Thank you sooooo much

[@louelynatilano8853]

how do you get 1.5?????

[@xtraxearthling]

he plugged in the values and solved for Hi. so it was -(3cm)x (6cm/12cm) which gives -18/12. plug this into a calculator and it gives you the value of -1.5

[@svnjm]

how did it change to 3/12 😭

[@satan4047]

In the Concave Mirror: Distance of Image from the Mirror = 6 cm Height of the Image = -1.5 cm In the Convex Mirror: Distance of Image from the mirror = 3 cm Height of the Image = 0.75cm

[@juicebox2181]

My teacher gave us 1/f= 1/p+1/q..... okay I’m confused

[@sriii5]

It's the same... It's always 1/focal length=1/distance of object+1/distance of image

[@MihirBhatol]

Your sign determinations of focal length (f) are wrong 👊👊👊👊

[@acegabrielgo5422]

Duuuude, it's supposed to be 0.5, not 1.5...

[@diya858]

Object distance is 'never' ever POSITIVE !

[@benhardsim8629]

why ? i am seriously curios , because my text book also say that

[@xxmemestar69xx82]

Aaheli Ghosh hazra what does this comment even mean? It’s always positive, you can’t have a negative distance.

[@svijayiitk]

It is

[@svijayiitk]

OFC It is

[@theturniptress805]

Hey people , its because different sign conventions are taught in different countries/regions/curriculums etc.. For example, I am Indian and I was taught that any distance towards the left of the mirror or lens is negative and the distances on the right side are taken as positive. What you are taught in your schools can of course be different to that. Both lead to correct answers.