Light - Study Mode
[#71] Which one of the following phenomenon is used in optical fibres?
Correct Answer
(C) Total internal reflection
[#72] The Sun is visible to us a few minutes before the actual sunrise because of
Correct Answer
(D) Refraction of light
[#73] The number of colours contained in the Sunlight is
Correct Answer
(D) 7
[#74] If you look into a mirror and find that the image (your reflection) is smaller than you, then the type of mirror is:
Correct Answer
(D) convex mirror
[#75] The change in focal length of an eye lens is caused by the action of the . . . . . . . .
Correct Answer
(C) ciliary muscle