51. The colour of an opaque object is due to the colour it
52. Magnification is
53. When we see the sky from a plane in high altitude, then it seems
54. Rainbow is produced when Sunlight falls on drops of rain, which of the following physical phenomena are responsible for this?
1. Dispersion
2. Refraction
3. Internal reflection
Select the correct answer:
1. Dispersion
2. Refraction
3. Internal reflection
Select the correct answer:
55. Which colour of light shows maximum deviation when passed through a prism?
56. Light rays move in straight lines. But through an optical fibre, they can move in any type of zig-zag path because
57. Red is used as an emergency or danger signal as
58. When light passes from one medium to another medium, which one of the following does not change?
59. The formation of glittering colours in thin foam of soap is the result of which of the following phenomenon?
60. The primary colours in photography are
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