Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Ray Optics

Question:

For an astronomical telescope having objective lens of focal length 10 m and eyepiece lens of focal length 10 cm, telescope's the tube length and magnification respectively are __________.

Fill in the blank with the correct answer from the options given below.

Options:

20 cm, 1

1000 cm, 1

1010 cm, 1

1010 cm, 100

Correct Answer:

1010 cm, 100

Explanation:

$ L = f_0 + f_e = 1000cm + 10cm = 1010 cm$

$ M = \frac{f_0}{f_e} = \frac{1000cm}{10cm} = 100$

The correct answer is Option (4) → 1010 cm, 100