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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 imagewill be a)f teta b)f teta /2 c)f/teta d)2f teta

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 imagewill be a)f teta b)f teta /2 c)f/teta d)2f teta

 
 
 

Grade:12th pass

1 Answers

Arun
25750 Points
4 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)
 
Hipe ot helps

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