28. Two plane mirrors OP and OQ are inclined at an acute angle (diagram is not to scale). A ray of light XY parallel to OQ strikes mirror OP at Y. The ray is reflected and hits mirror OQ, is reflected again and hits mirror OP and is reflected for a third time and strikes mirror OQ at right angles at R as shown. If OR = 5 cm, what is the distance d of the ray XY from the mir- ror OQ? (A) 4 cm (B) 4.5 cm (C) 5 cm (D) 5.5 cm (E) 6 cm O 5 R 0 X

11:19 Optics.pdf -> 2. Find angle ø. (Hint: Use Geometry skills.) 79.4712° Air, n, = 1 3. Find the second angle of 30 incidence. 10.5288° Horiz. ray, parallel to 4. Find the second angle of refraction, 0, using Snell's Law 15.9° base Glass, n = 1.5 Refraction Problem #2 Goal: Find the distance the light ray displaced due to the thick window and how much time it spends in the glass. Some hints given. 20° 0, 1. Find 0. 20° H,0 2. To show incoming & outgoing rays are parallel, find 0. 20° n, = 1.3 3. Find d. 0.504 m glass 10m 4. Find the time the light spends in the glass. n = 1.5 5.2 · 10-8 s Extra practice: Find 0 if bottom medium is replaced with air. H,0 26.4° Refraction Problem #3 Goal: Find the exit angle relative to the horizontal. 0 = 19.8° 36 air glass The triangle is isosceles. Incident ray is horizontal, parallel to the base.

A man shines a flashlight from a boat into the water, illuminating a rock as in the figure below. What is the angle of incidence ₁ (in degrees)? HINT O 0₁ 2.72 ml 2.05 m-

8. Light strikes the 70° glass prism (n = 1.51) with an angle of incidence of 50.0°. Calculate the angle that the light leaves the prism. (73.9°) 70d 9. Light is incident on an equilateral Lucite prism (n = 1.5) at an angle of 35°. Calculate the angle that the light leaves the prism. (66°) %3D ? 10. Freddie the fish shines his flashlight upward from under water. If Freddie shines his flashlight at an incident angle of 20°, at what angle does the light leave the water? (27°) В. A. Beyond what critical angle will the light no longer be able to leave the water? (48.8°) 11. From inside an aquarium a ray of light is directed at the glass so the angle of incidence, in water, is 30°. (a) Determine the angle of refraction when the ray emerges from the glass into the air. (b) If the angle of incidence in the water is 52° at what angle will the rays emerge from the glass? (42°, no ray emerges) water air n = 1.33 n = 1.00 30° glass n = 1.50

Problem 6: Suppose the shiny back of a spoon has a 2.8 cm radius of curvature. Part (a) Calculate the focal length fof the mirror formed by the shiny back of the spoon in meters. f= sin() cos() tan() 7 8 HOME cotan() asin() acos() E 4 5 6 atan() acotan() sinh() 1 2 3 cosh() tanh() cotanh() END O Degrees Radians VOl BACKSPACE DEL CLEAR Submit I give up! Hint Feedback Part (b) What is the mirror's power, in diopters?

Photographs at a scale of S are required to cover an area X - mi square. The camera has a focal length and focal plane dimensions of 9 * 9in . If endlap is 60% and sidelap 30\% how many photos will be required to cover the area for the data given below?   ▾ Part A   S = 1/6500 ; X = 8 f = 152.4mn   Express your answer as an integer.

110. The two mirrors refra shown meet at a right light angle. The beam of light in the vertical plane P strikes mirror 1 as shown. Determine red Light i beam Mirror of g sket (a) the 40.0% the distance the reflected viol light beam travels before striking mirror 2. (b) In what direction does the 1.25 m Mirror Ext light beam travel after reflecting from mirror 2? 116 unde shov 111. A cylindrical cistern, constructed below ground level, is 3.0 m in diameter and 2.0 m deep and is filled to the brim with water. A small object rests on the bottom of the cistern at its center. How far from the edge of the cistern can a girl whose eyes are 1.2 m from the ground stand and still see the object? shap 1. vibr elec 118. 112. Consider a common mirage formed by superheated air just above a roadway. A truck driver whose eyes are 2.00 m above the road, where n= 1.000 3, looks forward. She has the illusion of seeing a patch of water ahead on the road, where her line of sight makes an angle of 1.20°…

Rays of the Sun are seen to make a 33.0​∘ angle to the vertical beneath the water. At what angle above the horizon is the Sun?

MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A mirror hangs 1.80 m above the floor on a vertical wall. A ray of sunlight, reflected off the mirror, forms a spot on the floor 1.07 m from the wall. Later in the day, the spot has moved to a point 2.50 m from the wall. (a) What is the change in the angle of elevation of the Sun, between the two observations?