The sun (diameter D) subtends an angle of θ θ radians at the pole of a concave mirror of focal length f. The diameter of the image of the sun formed by the mirror is
A
f θ θ
B
C
2 f θ θ
D
D θ θ
Text Solution
Verified by ExpertsThe correct answer is:
A
Since the sun is at very large distance, p = ∞ ∞
⇒ ⇒ 
⇒ ⇒ q = f
If the diameter of the image be d, 
⇒ ⇒ d = (2 α α ) q Putting 2 α α = θ θ and q = f we obtain, d = f θ θ
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