NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Physics
- Chapter
- Wave Optics
NTA Abhyas 2020 · Physics · Wave Optics
A ray of light of intensity I is incident on a parallel glass-slab...
A ray of light of intensity is incident on a parallel glass-slab at the point and it undergoes partial reflection and refraction as shown in the figure. At each reflection,& of the incident energy is reflected and the rest is transmitted. If the rays and undergo interference, then the ratio is
Options
- A
- B
- C
- D
Correct answer
D.
Step-by-step solution
From figure and
By using \dfrac{{I}_\max}{{I}_\min} = {\left(\dfrac{\sqrt{\dfrac{{I }_{2}}{{I }_{1}}} + 1}{\sqrt{\dfrac{{I }_{2}}{{I }_{1}}} - 1}\right)}^{2} = {\left(\dfrac{\sqrt{\dfrac{9}{1 6}} + 1}{\sqrt{\dfrac{9}{1 6}} - 1}\right)}^{2} = \dfrac{4 9}{1}
By using \dfrac{{I}_\max}{{I}_\min} = {\left(\dfrac{\sqrt{\dfrac{{I }_{2}}{{I }_{1}}} + 1}{\sqrt{\dfrac{{I }_{2}}{{I }_{1}}} - 1}\right)}^{2} = {\left(\dfrac{\sqrt{\dfrac{9}{1 6}} + 1}{\sqrt{\dfrac{9}{1 6}} - 1}\right)}^{2} = \dfrac{4 9}{1}