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9:17 AM
The number of reflections including the initial one will be number of such triangle with base d in the upper plate + 1?
We can verify this for small n:
n                      reflection:
1                      2
2                      3
3                      4
So answer to this should be 31 , no?
@JohnRennie Can you take a look here 👆 when you get time :)
I guess it depend on whether you count the very last reflection where I've drawn the blue box. I would count it, and then I get 31 as well. If you don't count it then you get 30.
9:38 AM
Oh
@JohnRennie I think that must be the reason why it is not in the options.
Does the answer key give B?
Yes.
OK. It depends on whether you take the length of the mirror to be an open or closed interval :-)
I still think 31 is correct, but of the options given only 30 could be correct.
@JohnRennie When is the spherical aberration less in plano convex surface? When the plane side face object or vice versa?
I think when object face plane surface as there will be refraction(angle change) once.
But the answer is opposite...
I don't know ...
9:44 AM
I think I have to learn it as a fact ...
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