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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

Grade:12th pass

## 2 Answers

Arun
25763 Points
one year 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
14149 Points
one year 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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