A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focussed on a distant object is such a way that parallel rays comes out from the eye lens. If the object subtends an angle 2° at the objective, the angular width of the image
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a
10°
b
24°
c
50°
d
16°
answer is B.
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Detailed Solution
Since m=fofe Also m= Angle subtended Angle subtended by the image ∴fofe=αβ⇒α=f0×βfe=60×25=24∘
A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focussed on a distant object is such a way that parallel rays comes out from the eye lens. If the object subtends an angle 2° at the objective, the angular width of the image