# Question: a If a book is held 30 cm from an

(a) If a book is held 30 cm from an eyeglass lens with a focal length of – 45 cm, where is the image of the print formed?

(b) If an eyeglass lens with a focal length of + 57 cm is used, where is the image formed?

(b) If an eyeglass lens with a focal length of + 57 cm is used, where is the image formed?

## Relevant Questions

To correct myopia (nearsightedness), concave lenses are prescribed. If a student can read her physics book only when she holds it no farther than 18 cm away, what focal length of lens should be prescribed so she can read ...The geometry of a compound microscope, which consists of two converging lenses, is shown in Fig. 23.29. (More detail on microscopes is given in Chapter 25.) The objective lens and the eyepiece lens have focal lengths of 2.8 ...A plastic plano-concave lens has a radius of curvature of 50 cm for its concave surface. If the index of refraction of the plastic is 1.35, what is the power of the lens? For the arrangement shown in Fig. 23.31, an object is placed 0.40 m in front of the converging lens, which has a focal length of 0.15 m. If the concave mirror has a focal length of 0.13 m, where is the final image formed, ...To study wave interference, a student uses two speakers driven by the same sound wave of wavelength 0.50 m. If the distances from a point to the speakers differ by 0.75 m, will the waves interfere constructively or ...Post your question