1.

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_______.

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_______.



Discussion

No Comment Found