The length of a telescope, for which it is known that it has an objective lens of focal length 144 cm and an eye piece of focal length 6 cm , is

Question

The length of a telescope, for which it is known that it has an objective lens of focal length 144 cm and an eye piece of focal length 6 cm , is (A) 1.5 m (B) 1.44 m (C) 1.38 m (D) 1.56 m

Tardigrade Admin · Accepted Answer

The length of a telescope is l=f0+fe Given, f0=144 cm=1.44 m,fe=6.0cm=0.06 m l=1.44+0.06=1.5m

Q. The length of a telescope, for which it is known that it has an objective lens of focal length $144 c m$ and an eye piece of focal length $6 c m$ , is

$1.5 m$

$1.44 m$

$1.38 m$

$1.56 m$

The length of a telescope is
$l = f_{0} + f_{e}$
Given,
$f_{0} = 144 c m = 1.44 m, f_{e} = 6.0 c m = 0.06 m$
$l = 1.44 + 0.06 = 1.5 m$

Q. The length of a telescope, for which it is known that it has an objective lens of focal length 144cm and an eye piece of focal length 6cm , is

1.5m

1.44m

1.38m

1.56m