Key in the ray optics answers

Exercise and reference answers

Questions

1. Hint

   Focal length is half the radius of curvature.

   Unit

   cm

   Answer

   7.5

   Question

   A mirror has radius of curvature 15 cm. Focal length, in cm, size only?

2. Unit

   dioptre

   Answer

   2

   Question

   A glass lens has focal length 0.5 m. What is its power?

3. Answer

   100

   Question

   A telescope has objective 100 cm and eyepiece 1 cm. Magnifying power?

4. Hint

   Multiply the objective magnification by the eyepiece magnification.

   Answer

   250

   Question

   Compound microscope, tube 20 cm, objective 1.0 cm, eyepiece 2.0 cm, near point 25 cm. Total magnification?

Instructions

Work each one out, key the number into the pad and submit it.

Explanation