Question

1. Colour of light having maximum speed in air is :
(a) red
(b) yellow
(c) violet
(d) blue
2. The wave length of light can be experimentally found using :
(a) ripple tank
(b) diffracting grating
(c) plane mirror
(d) glass prism
3. The phenomenon of diffraction of light was discovered by :
(a) Garibaldi
(b) Fresnel
(c) Newton
(d) Huygens
4. The phenomenon of diffraction of light was discovered by :
(a) Garibaldi
(b) Fresnel
(c) Newton
(d) Huygens
5. Electromagnetic radiation of highest frequency is :
(a) y-rays
(b) X-rays
(c) radio waves
(d) Infrared waves
6. In Fresnel's diffraction the wave front is :
(a) plane
(b) spherical
(c) none of these
7. In Fraunhofer diffraction the incident wave front is :
(a) plane
(b) spherical
(c) cylindrical
8. An experimental verification of Fresnel's theory of half-
period zones is provided by an optical device known as:
(a) L-G plate
(b) none plate
(c) Echelon grating
9. A zone plate is a :
(b) curved glass plate
(a) plane glass plate
(c) none of these
10. A convex lens has :
(b) two foci
(a) one focus
(c) more than two foci
11. A zone plate hs
(b) two foci
(a) one focus
(C) number of faci between the plte and the brightest focus
12. In the propagation of electro magnetic waves, the angle
between the directions of propagation and the plane of
polarisation is :
(a) 0°
(b) 45°
(d) 180°
(C) 90°​

Answer 1

Answer:

1)Red

2)glass prism

3)Fresnel

4)Fresnel

5) y- rays i.e. gamma rays

6)plane

7)Spherical

8)none plate

9)curved glass plate

10)Two foci

11)one focus

12)90°

Answer 2

Explanation:

1. (a) red

2. (d) glass prism

3. (d) Huygens

4. (d) Huygens

5. (a) Y rays

6. (a) plane

7. (b) spherical

8. (b) None plate

9. (a) plane glass plate

10. (b) two foci

11. (c) number of faci between the plte and the brightest focus

12. (c) 90°