Question

The focal lengths of the lenses of an astronomical telescope are 50 cm and 5 cm. The length of the telescope when the image is formed at the least distance of distinct vision is

• A. 45 cm
• B. 55 cm
• C. $\frac { 275 } { 6 }$cm
• D. $\frac { 325 } { 6 }$cm

Answer 1

Answer: (D)

$\frac { 325 } { 6 }$cm

Answer 2

By using