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Optical Instruments for JEE: 14 solved questions

Real JEE 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 2003 to 2026. No sign-in needed to read them.

What this topic asks

• Microscopes — 8 questions
• Telescopes — 6 questions

All 14 questions with solutions

• A compound microscope is designed with two symmetric biconvex lenses. The objective lens is cut vertically, c… JEE Main 5th April 1st Shift 2026
• In a microscope of tube length 10 cm two convex lenses are arranged with focal length of 2 cm and 5 cm. Total… JEE Main 24th Jan 1st Shift 2026
• If we need a magnification of 375 from a compound microscope of tube length 150 mm and an objective of focal… JEE Main 7th Jan 1st Shift 2020
• The image formed by an objective of a compound microscope is JEE Main 2003
• In a microscope the objective is having focal length f₀ = 2 cm and eye-piece is having focal length fₑ = 4 cm… JEE Main 21st Jan 1st Shift 2026
• An object viewed from a near point distance of 25 cm, using a microscopic lens with magnification '6' gives a… JEE Main 20th July 1st Shift 2021
• In a compound microscope, the magnified virtual image is formed at a distance of 25 cm from the eye-piece. Th… JEE Main 4th Sept 1st Shift 2020
• A compound microscope consists of an objective lens of focal length 1 cm and an eye piece of focal length 5 c… JEE Main 5th Sept 1st Shift 2020
• In a reflecting telescope, a secondary mirror is used to JEE Main 8th April 1st Shift 2023
• In normal adjustment, for a refracting telescope, the distance between objective and eye-piece is 30 cm. The… JEE Main 28th July 1st Shift 2022
• The magnifying power of a telescope with tube length 60 cm is 5. What is the focal length of its eye piece? JEE Main 8th Jan 1st Shift 2020
• An observer looks at a distant tree of height 10 m with a telescope of magnifying power of 20. To the observe… JEE Main 2016
• A telescope has an objective lens of focal length 150 cm and an eyepiece of focal length 5 cm. If a 50 m tall… JEE Main Online 2015
• This question has Statement-1, and Statement-2. Of the four choices given after the Statements, choose the on… JEE Main Online 2013