Question

Fill in the blanks

(1) The ________ at the point of incidence is called the normal.

(2) __________ is a light sensitive screen

(3) When two mirrors are kept parallel to each other the number of images is _____________.

(4) Kaleidoscope works on the principle of __________.

(5) The splitting of white light into its constituent colours is called ________.

(6) The coloured part of eye is _________.

(7) The ________muscles alter the ________ of the eye lens.

(8) The normal value for a ________ is approximately 25cm.

(9) Droplets of water split sunlight to form a spectrum known as ______.

(10) ________ can be corrected by using a concave lens of suitable focal length.

(11) Refraction occurs because the ________ of light is different in different medium.

(12) When white light passes through a prism, it is __________.

(13) In a Kaleidoscope, the mirrors make an angle of _______ with each other.

(14) The English Braille system uses _________ dots.

(15) Lateral displacement takes place due to refraction in a ________.

Answer 1

Answer:

1. angle of incidence

2. retina

3. indefinite

4. reflection

5. dispersion

6. iris

7. ciliary; focus

Bro itna hi aata h baki ka baad mein okkh

Answer 2

Answer:

1. perpendicular line
2. photoreceptors(Rods and Cones) in retina
3. infinite
4. reflection
5. dispersion
6. iris
7. cilliary muscles, focus
8. human eye
9. rainbow
10. MYOPIA / SHORT SIGHTEDNESS
11. speed
12. seperated in its components colors- red, orange, yellow, green, blue and violet. The separation of visible light into its different colors is known as dispersion.
13. 60°
14. six raised dots
15. glass slab