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Optical Instruments for GSEB: 4 solved questions

Real GSEB paper questions on optical instruments, part of ray optics and optical instruments. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2018 to 2022. No sign-in needed to read them.

What this topic asks

• Telescopes — 3 questions
• Microscopes — 1 question

All 4 questions with solutions

• If the tube length of an astronomical telescope is 105 cm and its magnifying power is 20 for normal setting,… GSEB Board March 2018
• For a compound microscope f₀=1 cm, fₑ=2 cm and the tube length L=20 cm. Then the total magnification is . GSEB Board August 2020
• The focal lengths of the objective lens and the eyepiece of a telescope are fₒ and fₑ respectively. The magni… GSEB Board March 2022
• The focal length of the objective is 100 cm and the focal length of an eyepiece is 1 cm, then the tube length… GSEB Board July 2022