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:

Options

• 20 times taller 

• 20 times nearer 

• 10 times taller 

• 10 times nearer

Answer 1

20 times nearer 

Explanation:

M = `theta_2/theta_0`,

20 = `("h"//"d"_"i")/("h"//"d"_0)`

⇒ 20 = `"d"_0/"d"_"i"`

⇒ d_i = `"d"_0/20`