GATE IN · 2018 · IN
Question 54: Communication and Optical Instrumentation
Give it a try, then reveal the answer to check your work.
Question 54
INNAT2 marksNeeds review
A Michelson Interferometer using a laser source of wavelength λ₀ = 500 nm, with both the mirrors (M₁ & M₂) fixed and positioned equidistant from the splitter/combiner is shown in the figure. When a dielectric plate of refractive index n = 1.5, of thickness t, is placed in front of the mirror M₂, a dark fringe is observed on the detector. If the dielectric plate is removed without changing the position of the mirrors M₁ & M₂, a bright fringe is observed on the detector. The minimum thickness t (in nm) of the dielectric is _______.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerEXPLORE & PRACTISE
Paper and topic context
See where this question comes from and choose what to practise next.
2018IN
GATE IN 2018 · Paper 1
Instrumentation Engineering · Original paper archive
- Section
- Instrumentation Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
Practise related topics
Explore more previous year questions using this question’s imported topic tags.
instrumentation
GATE IN previous year questions
measurement
GATE IN previous year questions
process control
GATE IN previous year questions
communication optical instrumentation
GATE IN previous year questions
Communication and Optical Instrumentation
GATE IN previous year questions
Comments
Ask a question, share your approach, or help someone understand.
Log in to view the discussion
You’re not logged in. Log in or create an account to see discussions and add comments.