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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10°

24°

50°

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∘

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