Q1: a) Sketch simple icons to represent the following operations to appear on a digital camera screen: Turn image 90 degrees sideways. Auto-enhance the image. Fix red-eye. Crop the image.  b )And justify how your icons are easy to understand for new users.

HW8 Q10 A magnifying glass is a single convex lens with a focal length of f= 13.0 cm. What is the angular magnification when this lens forms a (virtual) image at −∞? How far from the object should the lens be held? What is the angular magnification when this lens forms a (virtual) image at the person's near point (assumed to be 25 cm)? How far from the object should the lens be held in this case?

A magnifying glass works because: Select one: a. The virtual image of the object is further away from the eye than the object, but larger than the object, making detail easier to see O b. The image made by the magnifier is real C. The virtual image of the object is brighter than the object, making detail easier to see d. The virtual image of the object is closer to the eye than the object, making detail easier to see Check

1. What is the focal length of a makeup mirror that produces a magnification of 1.51 when a person's face is 12.2 cm away? Think & Prepare: 1. What kind of mirror causes magnification? 2. What kind of image is it? 3. What signs will the different quantities have? (a) Set-up the table for some known quantities. i) Make sure to use the correct sign for the image distances, object distances, and the focal lengths. ii) Make sure to use the correct sign for the image and object heights. Inverted object and image heights are negative. iii) Do NOT do any calculations for this section. do = V cm M= (b) What is the focal length? f = cm

Problem 96. Indicate the single lens type (converging or diverging) and object position that will lead to the following kind of images. If no single lens system can produce the particular image indicate that this is so. A) real, upright, enlarged image. B) huge image at "infinity". C) real, enlarged, inverted image. D) tiny inverted image very near the focal point. E) real, reduced in size, inverted image. F) virtual, reduced in size, upright image. G) virtual, enlarged, upright image. H) real, inverted image that is the same size as the object. I) virtual, enlarged, inverted image. Problem 97. You are handed a converging lens and you have a ruler. Describe two different simple ways to determine the focal length of this lens. Each way should involve making only one measurement.

Which of the following statements is not consistent with geometric optics.   a. Light rays propagate at small angles relative to the optical axis.   b. The diffraction of light is neglected.   c. Light rays propagate in straight lines.   d. Light rays propagate near the optical axis.   e. Ordinary objects always exhibit specular reflection when exposed to light.

Which of the following statements for single optic devices are true? Choose all that apply. a. Any physicist worth their weight in garbanzo beans (not chick peas) knows that concave lenses will have a positive focal length. b. For virtual images, the image distance is positive and the object distance is negative. c. By convention, if the image height is positive then the image is upright. d. If an optic produces an image with a magnification of 0.6, then the image is diminished. e. Experiments have shown that convex mirrors can create real images. f. If an image has a magnification of -6, then the image is real.

1. Assume that a camera has a bi-convex lens. Should you move the lens toward or away from the sensor in order to zoom in (magnify)? 2. A camera has a bi-convex lens whose focal length is 50mm. The lens’s range of motion is 5.56mm starting from 50mm from the sensor and moving away. What are the minimum and maximum possible object positions for which the image is in focus? 3. For the camera in the previous question, when a 300mm tall object is at the minimum distance, will it fit on a Canon APS-C sensor? Hint: Look up the size of this camera sensor. 4. See Figure 10.7! A circular piece of glass (n=1.5) has been cut in half as shown and is being used as a lens for a set of five parallel rays. The angles at which the rays are incident on the circular side of the lens are shown, and the image is drawn to scale. First, calculate the 5 angles of refraction for each of the 5 angles of incidence, respectively. Second, use a protractor to draw the refracted rays such that they intersect the…

An eyeglass prescription that specifies a power of -1.0 diopters is describing a lens that has a focal length of O a. + 1 meter O b.- 100 cm O C. - 1 meter O d. - 1 cm An object placed 25 cm to the left of a +20 cm focal length lens produces a real image 100 cm to the right of the lens. What is the magnification? O a. - 4 Ob. - 0.25 O C. + 2 O d. - 1

Create a ray diagram for eyeglasses that contain a diverging lens. Assume you are looking at a 2 cm tall object that is 4 cm from the lens. The focal length is 3 cm. What type of vision are they used to correct? Give both names. How do they do this? Explain.