Doubtclip is an AI tutor that turns any homework or exam doubt into a step-by-step whiteboard video lesson with diagrams, formulas, and voice explanation.

Which subjects and exams does it support?

It supports Physics, Chemistry, Mathematics/Calculus and related STEM doubts for school boards, JEE, NEET, and global high-school / undergrad practice.

How do I get a video solution?

Upload a photo of the question or paste the text, sign in, and Doubtclip generates a whiteboard-style explanation video you can watch and share.

Is Doubtclip available worldwide?

Yes. Doubtclip is a web app for students globally. Lessons are available in English and Hinglish.

Ray Optics

NEET level, single correct, medium

2 of 295

Question 2 of 295

In the given ray diagram, an object $O$ is placed in front of a thin convex lens of focal length $f = 20\,\text{cm}$ . A real inverted image of the same size is formed at $I$ . The distance between object $O$ and image $I$ is:

Show answer and solution

Answer: (B) $80\,\text{cm}$

When object is at

2f

, real inverted image of same size is formed at

2f

on other side. Total distance

= 2f + 2f = 4f = 4(20) = 80\,\text{cm}

NEET question paper PDF

The full paper for each year. Open it on this page or download it.

NEET 2025 question paper (Code 45)

Open Download PDF

Opening paper…

Explain it as a whiteboard videoStep-by-step, in Hinglish or English. Your first video needs no login.Solved it on paper but got it wrong?Upload a photo of your working. Mistake Doctor marks the exact line that broke.

See it move: Lens ray diagram simulationDrag the sliders and watch the numbers in this question change.Revise Ray Optics firstFormula sheet, solved examples and the traps students fall into.

More Physics practice

NEET Physics practice question on Ray Optics, with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.

In the given ray diagram, an object OOO is placed in front of a thin convex lens of focal length f=20 cmf = 20\,\text{cm}f=20cm. A real inverted image of the same size is formed at III. The distance between object OOO and image III is:

NEET question paper PDF

More Physics practice

In the given ray diagram, an object $O$ is placed in front of a thin convex lens of focal length $f = 20\,\text{cm}$ . A real inverted image of the same size is formed at $I$ . The distance between object $O$ and image $I$ is: