💡 Light
1.Who proposed the 'Wave Theory' of light
Ans-Huygend
2. The velocity of light was Fird measured by-
Ans- Romer
3. Light travelles in-
Ans- Stright line
.4.The speed of light in vacuum is
Ans- 38X 10 to the power 8 m/s
5. RThe velocity of light is minimum in-
Ans-Glass
6. The velocity of light in-
Ans- Vacuum
7.. How many types of mirror
Ans - Two types of mirror ( Plane mirror , Spehrical mirror)
8. Where the plane mirror used
Ans-Looking glass,Periscope etc
9. The nature image formed bya plane mirror-
Ans- Virtual and erect
10. The focal length of a plane mirror is
Ans- Infinity
11.the power of a plane mirror is
Ans - Zero
12. how many tyes of Spherical mirror
Ans- Two tyes ( Convex mirror , Concave mirror)
13. Where the convex mirror use-
Ans- Back view mirror in vehicles , street lamps ets.
14. where the concave mirror is used in-
Ans- Shaving mirrors, Shades os table lamp , Search lights etc
15.A virtual image larger than the object can be formed by s-
Ans- Concsve mirror
16. Refrsvtion of light
Ans- Change in velocity of ligjht
17.Who made the laws of refracation-
Ans- Snell
18. critical angel for total internal reflection will be smallest for light travelling form
Ans- Glass to Air
19. mirage is observed in a desertt due to the phenomenon of -
Ans - Total international reflection
20. The well cut diamond appears bright because -
Ans- Total internal reflectiion
21.The air bubbles in glass paper weigh apper silvery white due to-
Ans- total internal reflection
22. Op[tical fiber works on the principle of
Ans- Total internal reflection
23. Optical fibers are mainly used for
Ans- Comunation, Endoscopy
24. An endoscope is a -
Ans- Narrow telescope
25.Which colour of light is Scarted maximum-
Ans- Violet colour of light
26. Which colour of light scartted minimum-
Red colour of lighjt
27. The sky appers blue because-
Ans- Scattering of light
28.The brilliant red colour of rising and setting sun is due to -
Ans- Scattering of light
29. Sea is blue because of
Ans- Reflication of sky and scattering of light by a water molecules
30.For astronaut in a space ship ,The sky appers -
Ans- Black
31.How many tyes of lentgh
Ans - Two tyeps (Concave lenses & convex lens)
32. the power of a lens is measured in
Ans- Diopter
33.What is the phenomenon of splitting white light into seven colours due to
Ans- Dispersion of light
34.Why red colour is used in traffic stop light
Ans-Red colour has the longest wave length
35.the shop colour bubbles have a brilliant colour in the sun light because
Ans- interferenece of the light
36. Rainbow is formed due to a combination of-
Ans- Disperison and totsl internal reflection
37. rain bow is cause due to
Ans- Refraction and total refraction of light by water droplates
38. which colour is in the center of rain bow
Ans- Green
39.telescope is used to see-
Ans-Heavenly body
40. In astronomical telescope focal length of objective is-
Ans Equal to eye lens
1.Who proposed the 'Wave Theory' of light
Ans-Huygend
2. The velocity of light was Fird measured by-
Ans- Romer
3. Light travelles in-
Ans- Stright line
.4.The speed of light in vacuum is
Ans- 38X 10 to the power 8 m/s
5. RThe velocity of light is minimum in-
Ans-Glass
6. The velocity of light in-
Ans- Vacuum
7.. How many types of mirror
Ans - Two types of mirror ( Plane mirror , Spehrical mirror)
8. Where the plane mirror used
Ans-Looking glass,Periscope etc
9. The nature image formed bya plane mirror-
Ans- Virtual and erect
10. The focal length of a plane mirror is
Ans- Infinity
11.the power of a plane mirror is
Ans - Zero
12. how many tyes of Spherical mirror
Ans- Two tyes ( Convex mirror , Concave mirror)
13. Where the convex mirror use-
Ans- Back view mirror in vehicles , street lamps ets.
14. where the concave mirror is used in-
Ans- Shaving mirrors, Shades os table lamp , Search lights etc
15.A virtual image larger than the object can be formed by s-
Ans- Concsve mirror
16. Refrsvtion of light
Ans- Change in velocity of ligjht
17.Who made the laws of refracation-
Ans- Snell
18. critical angel for total internal reflection will be smallest for light travelling form
Ans- Glass to Air
19. mirage is observed in a desertt due to the phenomenon of -
Ans - Total international reflection
20. The well cut diamond appears bright because -
Ans- Total internal reflectiion
21.The air bubbles in glass paper weigh apper silvery white due to-
Ans- total internal reflection
22. Op[tical fiber works on the principle of
Ans- Total internal reflection
23. Optical fibers are mainly used for
Ans- Comunation, Endoscopy
24. An endoscope is a -
Ans- Narrow telescope
25.Which colour of light is Scarted maximum-
Ans- Violet colour of light
26. Which colour of light scartted minimum-
Red colour of lighjt
27. The sky appers blue because-
Ans- Scattering of light
28.The brilliant red colour of rising and setting sun is due to -
Ans- Scattering of light
29. Sea is blue because of
Ans- Reflication of sky and scattering of light by a water molecules
30.For astronaut in a space ship ,The sky appers -
Ans- Black
31.How many tyes of lentgh
Ans - Two tyeps (Concave lenses & convex lens)
32. the power of a lens is measured in
Ans- Diopter
33.What is the phenomenon of splitting white light into seven colours due to
Ans- Dispersion of light
34.Why red colour is used in traffic stop light
Ans-Red colour has the longest wave length
35.the shop colour bubbles have a brilliant colour in the sun light because
Ans- interferenece of the light
36. Rainbow is formed due to a combination of-
Ans- Disperison and totsl internal reflection
37. rain bow is cause due to
Ans- Refraction and total refraction of light by water droplates
38. which colour is in the center of rain bow
Ans- Green
39.telescope is used to see-
Ans-Heavenly body
40. In astronomical telescope focal length of objective is-
Ans Equal to eye lens
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