Optics HW

  1. A lamp is moved from 34 cm to 90 cm above the pages of a book. Compare the illumination on the book before and after the lamp is moved.
  1. Light takes 1.28 s to travel from the Moon to Earth. What is the distance between them?
  1. An object is 22.0 cm in front of a concave mirror with a 7.0-cm focal length. Determine the image position.

(a)A convex mirror has a focal length of -14 cm. A lightbulb with a diameter of 6.1 cm is placed 60.0 cm from the mirror. Locate the image of the lightbulb.

(b)What is its diameter?

  1. A ray of light strikes a mirror at an angle of 62° to the normal.

(a) What is the angle of reflection?

(b) What is the angle between the incident ray and the reflected ray?

  1. A concave mirror has a focal length of 11.4 cm. What is its radius of curvature?
  1. Shiny spheres that are placed on pedestals on a lawn are convex mirrors. One such sphere has a diameter of 44.0 cm. A 12-cm tall robin sits in a tree that is 1.5 m from the sphere. Where is the image of the robin?

cm (from the mirror)

How tall is the image?

  1. Light in air is incident upon water at an angle of 45.0°. What is the angle of refraction?
  1. A stamp collector wants to magnify a stamp by 3.0 when the stamp is 4.0 cm from the lens. What focal length is needed for the lens?
  1. A ray of light travels from air into a material as shown in the figure below. The ray is incident upon the material at an angle of θ1 = 33.0°. The angle of refraction is θ2 = 19.6°.

(a) Using Snell's law, calculate the index of refraction of the material.

(b)What material is this? (type in the common name for the material)

  1. Refer to the table below. Use the index of refraction of diamond to calculate the speed of light in diamond.

2