Mathematical and Physical Journal
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Problem P. 4163. (April 2009)

P. 4163. Use a converging lens of diameter d and of power D dioptre and project the image of the Sun onto a white screen.

a) What is the size of the Sun on the screen?

b) By what factor will the image of the Sun on the screen be brighter than the rest of the screen which is directly shone by the Sun?

The angle subtended by the Sun is 32 arcminutes.

Data: D1=12 m-1, d1=35 mm; and D_{2}=\frac{1}{12}~\rm m^{-1}, d2=60 cm.

(4 pont)

Deadline expired on May 11, 2009.


19 students sent a solution.
4 points:Benyó Krisztián, Boros Csanád Örs, Emroz Khan, Farkas Márton, Hartstein Máté, Hohmann Balázs, Kovács 616 Philip, Lőrincz Dóra, Orosz Ákos, Tóth 222 Barnabás, Török 999 Csaba.
3 points:Krämer Zsolt, Lászlóffy András, Zelei Kristóf.
2 points:1 student.
1 point:3 students.
0 point:1 student.

Problems in Physics of KöMaL, April 2009