How many Optics questions come in JEE Main?

Optics is part of the Physics section (see the pattern questions in the section). Its share varies by paper; our tests give 15 per test so one topic is drilled at a time.

Are the JEE Main Optics questions free?

The first Optics test is free, with solutions. Later tests come with any JEE Main pass or ₹9 each.

How should I practise Optics for JEE Main?

Take one timed test, read every solution (right answers included), note the method you missed, then take the next test two days later. Compare with your Physics score in a full mock to see if the topic still costs marks.

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Optics questions for JEE Main

15 Optics questions for JEE Main Paper 1, in 1 timed test of about 36 minutes, each with solutions. Optics sits in the Physics section. The first test is free.

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Sample Optics questions

From the free test. Solutions open after you submit.

1. A thin biconvex glass lens (refractive index 1.5) has surfaces of radii of curvature 20 cm and 30 cm. What is its focal length in air?
- a. 12 cm
- b. 120 cm
- c. 6 cm
- d. 24 cm
2. Light of wavelength 600 nm in air enters a glass block of refractive index 1.5. What are its wavelength and frequency inside the glass?
- a. 900 nm; 5 × 10¹⁴ Hz
- b. 400 nm; 3.33 × 10¹⁴ Hz
- c. 400 nm; 5 × 10¹⁴ Hz
- d. 600 nm; 3.33 × 10¹⁴ Hz

Optics tests

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FAQ

How many Optics questions come in JEE Main?: Optics is part of the Physics section (see the pattern questions in the section). Its share varies by paper; our tests give 15 per test so one topic is drilled at a time.
Are the JEE Main Optics questions free?: The first Optics test is free, with solutions. Later tests come with any JEE Main pass or ₹9 each.
How should I practise Optics for JEE Main?: Take one timed test, read every solution (right answers included), note the method you missed, then take the next test two days later. Compare with your Physics score in a full mock to see if the topic still costs marks.