Optics ?

[forest shoal]

What even is the q11

[cunning raven]

<@&1227987967939838003>

Note for OP

+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.

[distant pagoda]

ah

lemme pull out microsoft paint rq

[modest forge]

Radius of illumination right?

[distant pagoda]

the red ray of light is where total internal reflection happens

yes

[distant pagoda]

"all the rays coming out of water" i.e. all the rays till where total internal reflection doesnt happen

since you're given the refractive index of water, you can figure out the critical angle between water and air

[forest shoal]

Okk

[distant pagoda]

and then do geometry, basically

to figure out the radius

[forest shoal]

Idk why in exam I thought they were trying to make a lens 💀 💀 💀 💀

[distant pagoda]

lmfaoo

its worded very

oddly

[forest shoal]

Yeah

I think I solved it

[distant pagoda]

like only the people who knew this before would be likely to figure it out

bet

[forest shoal]

Thanks man

[distant pagoda]

npnp

[forest shoal]

+solved @dusky arch