GATE IN · 2020 · IN
Question 46: Communication and Optical Instrumentation
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Question 46
INNAT2 marksNeeds review
A laser beam of 10 mm beam diameter is focused onto an optical fibre using a thin biconvex lens as shown in the figure. The refractive index of the lens is 1.5. The refractive indices of the core and cladding of the fibre are 1.55 and 1.54 respectively. The minimum value of the focal length of the lens to attain the maximum coupling to the fibre (in mm, rounded off to one decimal place) is ____
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2020IN
GATE IN 2020 · Paper 1
Instrumentation Engineering · Original paper archive
- Section
- Instrumentation Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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