Question

(2marks each)
1. Determine whether the following material is positive or negative material and
evaluate its birefringence
a. Material A-n, = 2.616 & ne = 2.903
b. Material B - n. = 1.770 & ne = 1.762
2. Calculate the Brewster's angle for material with refractive index 1.2
3. Calculate the thickness of a crystal if it is a half plate crystal for wavelength
=5500A having no = 1.652 & ne = 1.486.
4. How many lines per inch are there in a grating which gives a first order spectrum at
an angle of 30° from the normal for light of wavelength 5000A.
5. What is the highest order spectrum which may be seen when light of wavelength
6000JA is passed through a diffraction grating having 12000lines to an inch?​

Answer 1

Answer:

What is the highest order spectrum which may be seen with a monochromatic light of wavelength 5000 Å by means of a diffraction grating with 5000 lines/cm? = 4. 10. A grating has 16000 per inch over a length of 5 inches.

Explanation:

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