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Foot of Perpendicular and Image
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The very important Foot of Perpendicular and Images are discussed in this video along with the multiple examples.

Sachin Rana is teaching live on Unacademy Plus

Sachin Rana
IVth Year UG, IIT Bombay | YouTuber (143k subs) | Mentored 3 under 100 ranks in JEE Advanced | No. 1 educator for Organic Chemistry

Comments
(8)
U
Unacademy user
Doubt : In the definition of Total internal reflection, you have written that "when a ray of light goes from rarer to denser medium"........ but i think it should be opposite "TIR occurs when ray goes from denser to rare medium."Please correct me if i am wrong. Thank you.
Riya sharma
2 years ago
yes, TRI occurs when light travels from denser to rarer medium. I too had the same doubt but later I confirmed it from different sources.
Moosa Iqbal
2 years ago
Thanks !!!
Ashish Mishra
2 years ago
yeah
Sir, is the image : (y+2)^2 = -(x+3). Using the fact that the line containing the image is perpendicular to the mirror and will have slope 1 we can consider some point on the image and putting that back in the equation of the parabola given to get the image.
Sachin Rana
a year ago
Yes, correct. Very good.
let the equation of parabola is x=ay^2+by+C assume some point on given parabola find its image and pit it in the equation the find the value of a b c
Sachin Rana
a year ago
I believe this won't be the correcr method. 3 variables.
Aditya Singh
a year ago
but my answer is right sir
Shreyas Raibole
5 months ago
assume x to be some variable and rewrite y in terms of it
(y+2)^2=-(x+3) Assume the points on parabola, then find the image After find image remove the parameter that we have assumed and the equation obtained will be our required image
Sachin Rana
a year ago
Yes, correct. Very good.
FR
Sir ,if the question was asked for a point at maximum distance instead of minimum distance then how shall we proceed?
(y+2) whole square = -(x+3
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