Recent content by silvercrow

But light doesn't escape because it slows down ? :p

I wad thinking since black holes are so dense ... lights speed would get slow significantly , so isn't it that if you are at light speed ( 3 x 10^8 m/s ) then you might come out of a black hole ? Its the same concept we learn in 10 grade ! Am i right ?

I think the observer is always at the centre no matter if he is on Earth or moon . He is the centre of the universe. Correct me if i am incorrect :)

No formula for lens is 1/image distance - 1/ object distance = 1/f

I don't know . The only data i know is in the picture

What is t and k ?

I know snells law. Can you do the question ?

I am currently in high school first year (10th) and i have been thinking about what to do . Cosmology and particle physics really appeal to me and they seem to be quite easy to me ,but i have no idea what courses to do ( well i think i will have to do masters and then move onto honours ) and how...

Only this id given in the question . I can't even start . Only its a example of total internal reflection .

Your ray diagram seems tovbe wrong because according to convention rays are drawn left to right :)

Yes sorry for wrong unit . I frankly didn't notice that .

Thank you guys . :D

Wait i was taking focal length as negative :P . I started this chappter two days ago ... but the ray is not reaching the concave lens so why consider it ?

Image distancecis coming -150/8 cm By the formula 1/v - 1/u = 1/f V = image distance U = object distance F = focal length

Since momentum = mass x velocity Therefore for light P = mv P = 0 x 3x10^8 P = 0 m/s Can anybody explain ?