Susan is quite nearsighted; without her glasses, her far point is 35 cm and her near point is 15 cm. Her glasses allow her to view distant objects with her eye relaxed. With her glasses on, what is the closest object on which she can focus?

## Problem 19.43

A microscope with a 5 X objective lens images a 1.0 mm diameter specimen. What is the diameter of the real image of this specimen formed by the objective lens?

## Problem 18.73

A 2.0 cm tall candle flame is 2.0 m from a wall. You happen to have a lens with a focal length of 32 cm. How many places can you put the lens to form a well-focused image of the candle flame on the wall? For each location, what are the height and orientation of the image?

## Problem 18.66

You need to use a 24 cm focal length lens to produce an inverted image twice the height of an object. At what distance from the object should the lens be placed?

## Problem 18.53

One of the contests at the school carnival is to throw a spear at an underwater target lying flat on the bottom of a pool. The water is 1.0 m deep. You’re standing on a small stool that places your eyes 3.0 m above the bottom of the pool. As you look at the target, your gaze is 30° below […]

## Problem 18.44

A laser beam is incident on a mirror at an angle of 30°, as shown in Figure 18.44. It reflects off the mirror and strikes a wall 2.0 m away at point P. By what distance does the laser spot on the wall move if the mirror is rotated by 10°?

## Problem 17.65

Figure P17.65 shows the light intensity on a screen behind a single slit. The wavelength of the light is 500 nm and the screen is 1.0 m behind the slit. What is the width (in mm) of the slit?

## Problem 17.54

The wings of some beetles have closely spaced parallel lines of melanin, causing the wing to act as a reflection grating. Suppose sunlight shines straight onto a beetle wing. If the melanin lines on the wing are spaced 2.0 μm apart, what is the first-order diffraction angle for green I ight (A= 550 nm)?

## Problem 17.47

White light (400-700 nm) is incident on a 600 line/mm diffraction grating. What is the width of the first-order rainbow on a screen 2.0 m behind the grating?

## Problem 17.40

Your friend has been given a laser for her birthday. Unfortunately, she did not receive a manual with it and so she doesn’t know the wavelength that it emits. You help her by performing double-slit experiment, with slits separated by 0. 18 mm. You find that two adjacent bright fringes are 5.5 mm apart on a screen 1.6 m […]