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If I want to reflect sunlight by using concave mirror which had 10cm*10cm size, how much the focal length of concave mirror should be designed in order to obtain 1.5 times light reflection size which had 15cm*15cm?

I think this mirror should be convex mirror with the total area 51 square meters of three giant mirror

Thank you for your quick reply. I want to know the formula of the rate of divergence of the beam.

There are a place installed eclipse shape of mirror to reflect the sunlight to the area that is not enough sunlight in the town. In this case, they installed 51 square meter mirror and provide the sunlight to the area of 600 square meter with the mirror located 450 meter above the town. Can I know what is the formula to calculate the area of sunlight reflection? https://www.visitnorway.com/listings/the-giant-sun-mirrors-in-rjukan/3632/

There are sunlight reflection on the wall which from the convex mirror. The reflection area is two times larger than original size of concave mirror. Can I know how to calculate the focal length of this convex mirror? Thank you for advance.

Our delivery order placed on 25% on peak hours, 15% on normal hours and 60% on discount hours throughout the year. And our order placed on 50% on each company. So what is the formula to calculate the average delivery fees throughout the year? Thank you for advance.

Understood. But still thank you for your help along this time

Can I know what kind of information that you needed? I will try my best to get it

Thank you for reply 1. I need the curvature at the beginning 2. I am not sure whether the cylinder is the shape that is suitable or not as the maximum diameter of cylinder can be build is 1.5 meters only

Hi Genady, can you elaborate more about the angle that you stated? I had a little bit confused on the angle that you mentioned and curvature. Currently manufacturer required us to provide the diameter and curvature information of mirror to create the prototype for us.

Thank you for your reply. How about the curvature, do you had any ideas on it?

From the answer that you given, the curvature is around 55 degree, am I right? As you said, we will do it in optimum cylinder shape to maximize the light reflect to the wall

You means there is impossible to do that?

This is practical problem.

I want find the radian, not radius. Radian is a unit for measuring an angle.