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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

3 months ago

Arun
23020 Points

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
3 months ago
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• 731 Video Lectures
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• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions