Answer: t(1-1/n).
- A t(1-1/n)
- B t(n-1)
- C t/n
- D t x (n-1)/n
Correct answer: A. t(1-1/n)
Explanation: Normal shift = t(1 - 1/n). A glass slab of thickness t shifts the image toward the observer by this amount.
Concave mirror ray construction: a ray parallel to the axis reflects through F, and a ray through F reflects parallel, locating the inverted real image. Image: Maxmath12, CC0, via Wikimedia Commons.
Concept context
Reflection, refraction, lenses, mirrors, total internal reflection.