1. Poisson's bright spot was discovered by:

2. The theory of expanding universe is confirmed by the observation of the spectral lines of the star, which shows :

3. The application of Doppler effect are:

4. Which of the following is conserved when light waves interefere?

5. In Young double slit experiment, a minimum is obtained when the phase difference of the superposing waves, is (n ∈ l):

6. The angle of minimum deviation of a prism depends upon the aggie of:

7. he minimum value of the refractive index is:

8. Polarization of light prove the :

9. Out of the following Statements which is not correct?

10. Polaroid glasses is used in sun glasses because :