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Fill in the blanks(1) A ray of light parallel to principal axis after reflection from concave mirror passes through _______(2) The focal length of _______ lens is positive.(3) The image of an object is formed behind _______ in hypermetropia.(4) An optical device used by watch repairers is _______(5) The power of spectacle for myopic eye is_______. |
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Answer» Fill in the blanks (1) A ray of light parallel to principal axis after reflection from concave mirror passes through _______ (2) The focal length of _______ lens is positive. (3) The image of an object is formed behind _______ in hypermetropia. (4) An optical device used by watch repairers is _______ (5) The power of spectacle for myopic eye is_______. |
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