21. The technique to integrate and mark the image of a three dimensional object is
22. An object is placed at the center of curvature of a concave mirror. Where will its reflection occur:
23. Suppose a rocketship is proceeding from the Earth at a speed of $${\frac{2}{{10}}^{th}}$$ the velocity of light. A light in the rocketship appears blue to the passengers on the ship. What colour would it appear to an observer on the Earth?
24. Which of the following pairs of position of object - position of image - size of image, of image is not correct for concave mirror?
25. Which is not a primary colour?
26. The focusing in the eye is done by
27. Tyndall effect is related to the . . . . . . . . . of light.
28. Which of the following is not used to make lenses?
29. In a periscope, the two plane mirrors are kept
30. The absolute refractive index of any medium is always:
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