I WANT PHYSICS

  Example questions 1  1)  Two converging lenses are to be placed in the path of parallel rays so that the rays remain parallel after passing through both lenses. How should the lenses be arranged? Explain with a neat ray diagram. ANS:   i) A parallel beam of light rays will converge on focal point of the lens after refraction. ii) Light rays passes through the focal point will parallel to principal axis after re-fraction. iii) So the two lenses are arranged   on a common principal axis such that their focal points coincide with each other, then the rays remain parallel after passing through both lenses. 2    2)  The focal length of a converging lens is 20cm. An object is 60cm from the lens. Where will the image be formed and what kind of image is it? ANS :   Given, f=20 cm                         U=-60cm ...