A reflecting telescope ( Figure 1 ) has a radius of curvature of 3.00m for its o

Question

A reflecting telescope (Figure 1) has a radius of curvature of 3.00m for its objective mirror and a radius of curvature of -1.55m for its secondary mirror. If the distance between the two mirrors is 0.90m , how far in front of the secondary mirror should you place the electronic sensor to record the image of a star?

A reflecting telescope (Figure 1) has a radius of curvature of 3.00m for its objective mirror and a radius of curvature of -1.55m for its secondary mirror. If the distance between the two mirrors is 0.90m , how far in front of the secondary mirror should you place the electronic sensor to record the image of a star?

Explanation / Answer

for the objective V1 = fo = R0 / 2 = 3 /2 =1.5 m

and then for the second mirror u2 = 0.9 - 1.5 = - 0.6 m

and so - 1/ 0.625 = - 1/ 0.3 + 1/ V2 , solving which you get V2 = 1.613 m

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