the number of throies of the solar system ............., each galaxy has distinctive shape according to ...........................and........... , explosion of some star suddenly , draw the image when the object less than F in concave mirror , the origin of solar system ........... according to la place , if the eye lens is a concave lens what happen , the object is put in 5 cm from a plane mirror if the object move 2 cm what is the distance between the first object and the second image , the number of galaxies ........... and the temperature within minutes equal ........., uses of lens , draw the concave lens.

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