JEE Main 2016 Physics question
An observer looks at a distant tree of height 10 m with a telescope of magnifying power of 20. To the observer, the tree appears
Answer: (2)
Solution
A telescope does not change the linear size of the object; what it multiplies is the *angle* the object subtends at the eye. An angular magnification of 20 means the tree subtends 20 times the angle it would with the naked eye. The same increase in subtended angle would be produced by bringing the tree 20 times closer
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