1 Plane mirrors, convex lens and concave lens.

2 He polished the convex lens of his telescope.

3 Conclusion Wearing lower degree convex lens can reduce incidence rate of myopia in primary school students.

4 The convex lens and planoconcave mirror thermal lens compensation methods are proposed and applied to a high power pumped Tm:YAP laser.

5 Two kinds of convex lens which make parallel rays converge to the focal point are given.

6 A convex lens is used to concentrate rays of light.

7 Wearing lower degree convex lens can reduce incidence rate of myopia in primary school students.

8 A convex lens causes rays to converge on a single point,[] the focal point.

9 On MRI, the lesion appeared double convex lens or egg in shape in coronal section and round or arrow head like in shape in sagittal section.

10 Methods Hypermetropia and myopia were induced by convex lens in front of eyes of 32 subjects.

11 There are six various plane and concave - convex lens.

12 This sensor adopts a sine-wave current generator and a magnetic coil to produce electromagnetic force that drives the convex lens to swing slightly.

13 In interference experiments with Newton's ring, considered only is the interference of the air film formed between the convex lens and the plain glass.

14 Conjugate method is an accurate, simple and convenient method to measure the focal distance of thin convex lens.

15 Methods Hypermetropia and myopia were induced by playing concave and convex lens in front of eyes of 32 subjects.

16 Firstly, a telescope system is made up with a concave lens and a long-focus convex lens, by which the angle of the parallel beam from the collimator can be change.