7. Differentiate between Fresnel and Fraunhofer diffraction. (MAR
20)
8. What is a diffraction grating?
9. What is Rayleigh‟s criterion?
10. What are polarizer and analyser?
11. What is double refraction? (JUNE 24)
12. Mention the types of optically active crystals with example.
13. What are the uses of spectrometer?
14. What is myopia? What is its remedy?
15. What is hypermetropia? What is its remedy?
16. What is astigmatism? What is its remedy?
17. What is presbyopia?
18. Differentiate between polarised and unpolarised light.
19. What are the shapes of wavefront for (a) source at infinite, (b)
point source and (c) line source?(M 25)
20. The ratio of maximum and minimum intensities in an interference
pattern is 36:1. What is the ratio of the amplitudes of the two
interfering waves?(Ex-1, CH-7) (MAR 23)
21. Find the polarizing angles for (i) glass of refractive index 1.5
and (ii) water of refractive index 1.33.(Example 7.17) (AUG 21, JUNE
23)
12th Physics Chapter 7 Important - 3 Marks
1. Obtain the relation between phase difference and path
difference. (MAR 25)
2. What is Fresnel‟s distance? Obtain the equation for Fresnel‟s
distance.
3. Mention the differences between interference and diffraction.
(JULY 22, AUG 21, MAR 24)
4. State and obtain Malu‟s law. (MAR 24)
5. List the uses of Polaroids. (MAY 22)
6. State and prove Brewster‟s law. (JUNE 23,MAR 25)
7. Discuss about pile of plates.
8. Discuss about Nicol prism.
9. Two light sources of equal amplitudes interfere with each
other. Calculate the ratio of maximum and minimum intensities.
(Exam- 7.3) (MAR 20)
10. A diffraction grating consists of 4000 slits per centimeter.
It is illuminated by a monochromatic light. The second order
diffraction maximum is produced at an angle of 30°. What is the
wavelength of the light used? (Example 7.12) (JUNE 24)
11. What is the angle at which a glass plate of refractive index
1.65 is to be kept with respect to the horizontal surface so that
an unpolarised light travelling horizontal after reflection from
the glass plate is found to be plane polarised? (Exam:7.18) (MAR
25)
12th Physics Chapter 7 Important - 5 Marks
1. Obtain the equation for resultant intensity due to interference
of light.
2. Explain the Young‟s double slit experimental setup and obtain
the equation for path difference.
3. Obtain the equation for bandwidth in Young‟s double slit
experiment. (MAY 22, JUNE 23)
4. Discuss the diffraction at single slit and obtain the condition
for nth minimum. (MAR 23)
5. Discuss the diffraction at a grating and obtain the condition
for the mth maximum.
6. Obtain the equation for resolving power of optical instruments.
7. Discuss about the simple microscope and obtain the equations
for magnification for near point focusing and normal focusing.
(MAR 24)
8. Explain about compound microscope and obtain the equation for
the magnification. (JULY 22, JUN 24)
9. Obtain the equation for resolving power of microscope.
10. Explain about Astronomical telescope and obtain the equation
for the magnification. (AUG 21)
11. Prove law of reflection using Huygens‟ Principle.
வாசகர்களின் கருத்துக்களை அன்புடன் வரவேற்கின்றோம்.