4.10 Two lenses having focal lengths f, +9.0 cm and f2 apart. If an object 2.50 cm high is located 20.0 cm in front of the first lens, calculate (a) the position and (b) the size of the final image. (c) Check your answer graphically. -18.0 cm are placed 3.0 cm %3D

4.To measure the focal length of a diverging lens, a converging lens is placed in contact with it as shown to the right. The sun's focused by this Image point made by first lens (object point for second lens) are rays combination at a point 28.5 cm behind Image made by second lens the lenses. If the converging lens has a focal length fc of 16 cm, what is the focal length of the diverging lens? (final image) fc -fr =28.5 cm

* 32. Use ray diagrams to locate the images of the following objects: (a) an object that is 10 cm from a convex lens of +15-cm focal length and (b) an object that is 10 cm from a concave lens of -15-cm focal length. (c) Calculate the image locations for parts (a) and (b) using the thin lens equation. Check for consistency.

1. A patient enters an eye doctor’s office and finds the doctor tells him that his near point is 10.0 cm. The doctor also finds the patient’s far point (with eyes relaxed) is 125 cm. Each eye lens can be assumed to be 2.00 cm from the retina. a) Between what limits (units: diopters) does the power of this patient’s lens (technically lens+cornea combination) vary? b) The doctor is going to prescribe glasses. Calculate the power of the eyeglass lens the patient should use for relaxed distance vision. Is the lens converging or diverging?

3. Two converging lenses above are placed 20.0 cm apart, both with focal lengths of 10.0 cm. A candle is 30 cm away from the first lens. By means of a neat ray tracing, locate the final image formed by the combination of the two lenses. b) Use mathematics to fully describe the image created by the lenses.

Question 1 A diverging lens has a focal length of 10 cm. An object is placed at a Not complete distance of 15 cm to the left of the lens. What is the image position? Marked out of 10.00 Select one: P Flag 10 cm to the left of the lens а. question O b. 6 cm to the left of the lens О с. 6 cm to the right of the lens O d. 15 cm to the left of the lens е. 15 cm to the right of the lens Check

A certain camera is able to focus on objects from 1.13 m to ∞o. Suppose you want to take an extreme close-up shot, with the camera 19 cm from the object. Find the focal length of a thin lens that could be placed directly in front of the camera lens such that the image of the close object would be in focus. (Let's denote the minimum and maximum values of the focal length by fmin and fmax, respectively.) 228 m -u I fmin = fmax = XX

A converging lens has a focal length of 20.0 cm. Construct accurate ray diagrams for object distances of (i) 60.0 cm and (ii) 6.67 cm. (a) From your ray diagrams, determine the location of each image. Image (i) distance = Image (ii) distance =