Question

A fish is 53 ㎝ below the surface of a pond. What is the apparent depth (in cm) when viewed almost directly above the fish? (For water, n a. 50 b. 60 c. 40 d. 70 15. from a position 1.33.) e. 110 16. An object 60-cm high is placed 1.0 m in front of a converging lens whose focal length is 1.5 m. Determine the image height (in cm). a. 60 b. 120 C. 92 d. 180 e. 83 Two slits separated by 0.10 mm are illuminated with green light (a - 540 nm). Calculate the distance (in cm) from the central bright-region to the fifth bright band if the screen is 1.0 m away. a. 2.3 b. 2.5 c. 2.7 d. 2.1 e. 2.0 17.

Answer 1

Apparent depth = 53/1. 33 = 39 . 85 almostequalto 40 cm u = -100 cm = -1 m , f = 1. 5 m using Lens formula 1/f = 1/v - 1/4 1. 5 = 1/v + 1/1 v = -3 m m = v/u = h^1/h h^1 = h(v/u) = 60 times 3/1 = 180 cm x = 5 lambda D/d = 5 times 540 times 10^-9 times 1/0. 1 times 10^-3 = 2. 7 cm