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.

Wave Optics

Olympiad (NSEP) level, single correct, hard

3 of 191

Question 3 of 191

In a Lloyd's mirror experiment, light reflected from a glass mirror interferes with direct light from a slit. The central fringe closest to the mirror surface is:

Show answer and solution

Answer: (A) Dark, due to $\pi$ phase shift on reflection

Reflection at the denser medium introduces a phase change of

\pi

(path difference of

\lambda/2

), turning the zero geometric path fringe into a dark fringe.

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: Wave optics: YDSE, diffraction and polarisation simulationDrag the sliders and watch the numbers in this question change.

More Physics practice

Olympiad (NSEP) Physics practice question on Wave Optics, with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.