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the sun sub stends an angle teta radian on the surface of the earth.if a convex lens of focal length F is used to obtain in a real image of the sun on a screen , the diameter of the image will be

ram kumarr , 5 Years ago
Grade 12th pass
anser 2 Answers
Arun

Last Activity: 5 Years ago

 
Since the object distance → so, the Image can be assumed to form at the focus. So,
r/f = tan(x/2)
where r is the radius of image, and “x” is the angle substended by the object, i.e. Sun.
So, d = 2r = 2ftan (x/2)

Vikas TU

Last Activity: 5 Years ago

Dear student 
This is the correct ans , 
For sun u = infinity 
Diameter of image = A'B'
1/v+ 1/u = 1/f 
v = f
Image formed at f of the concave mirror 
Q = A'B'/PF 
=d/f 
d =Qf 
Hope this helps 

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