Fisica

1. | When a ray of light after incidenting on a boundary separating two media comes back into the same media, then this phenomenon, is called reflection of light.(Refraction / Reflection) |
2. | Light affects the eye to produce the sensation of vision. (T/F) |
3. | Is light a electromagnetic wave?(T/F) |
4. | Speed of light is ___________________. |
5. | Arrange the speed of light inascending order with their respective medium. Vs , Vl , Vg .(Vs > Vl >Vg / Vs < Vl < Vg / Vs < Vl > Vg ) |
6. | Write Three example of luminous object. |
7. | Write three example of non-luminous object. |
8. | a)______________ b)_______________ c)__________________ d)_________________Name the Different beam of light. |
9. | What is a realimage? |
10. | What is a virtual image? |
11. | What do you mean by rectilinear propagation of light? |
12 | A point source of light will always produce:( a single ray / a parallel beam / a divergent beam) |
13. | Write two example of each medium. Transparent, Translucent and opaque. |
14. | Formation of shadows and eclipses are the direct consequences of ____________________ oflight.(rectilinear propagation / electromagnetic waves) |
15. | Rectilinear propagation of light means light travels in a straight line path.(T/ F) |
16. | A point source of light will always produce:(a single ray / a parallel beam / a divergent beam) |
17. | What is the focal length of a plane mirror?(infinite / on the mirror / at 1cm) |
18. | A concave mirror is placed in water. Will there be any changein focal length? Give reason. |
19. | Is light a E.M. wave? |
20. | What is the radius of a plane mirror? (infinite / on the mirror / at 1cm) |
21. | What is the angle of reflection if a ray falls normally on a plane mirror?(900 / 00 / not define) |
22. | Relate the focal length f and radius of curvature R.[ (f=R/2) , / (f=2R), / (R=f/2) ] |
23. | _________________ of light is the processwhich enables us to see different objects around us.(Refraction / diffraction / reflection ) |
24. | The return of light into the different medium after striking a surface is called reflection. check out the statement, is true or false. If false rewrite it. |
25. | Write the Laws of reflection. |
26. | Due to irregular reflection we can see an object through all direction.(T / F) |
27. | Ifobject is at 2m from the mirror then image is at ________m.(4 / 2 / 1 / 1.5) |
28. | Tick on the letters which does not show the property of lateral inversion.(A / B / U / X / Y/ C / R / O / T / H/G / Q) |
29. | Write the characteristics of the image formed by a plane mirror. |
30. | A lighted candle S stands in front of a vertical plane mirror as shown in the diagram below.a) show by means of aray diagram, the position of the image of the candle S. b) An observer at A can see the image, but an observer at B is unable to do so. Explain this. Mirror B A S |
31. | Number of images formed by the two parallel mirrors is ___________________.( one / two / three / infinite) |
32. | Draw the ray diagram of Simple Periscope. And at what angle mirror is placed with the frame.(900 / 450 /500) |
33. | When an object is placed between two plane mirrors inclined at an angle of 750, the number of images formed is (2 / 3/ 4/ 5) |
34. | Write down the formula for find out the no. of images formed by the two mirrors. |
35. | Define a focus. Also draw a ray diagram for it. |
36. | It is the straight line joining the pole of the mirror to its centre of curvature.(Aperture / principalaxis / Pole) |
37. | Differentiate between concave and convex mirror. |
38. | If a ray passing through the centre of curvature is reflected back along its own path. Show through the ray diagram. (T / F) |
39. | If a Ray passing through the focus gets reflected and become parallel to the _________________. |
40. | Where will the image be if the object is at focus of the concave mirror? Draw the...