COMEDK · Physics · 25. Ray Optics
A glass slab of 16 cm thickness has its bottom surface silvered. An air bubble is located inside the glass slab at a distance of 8 cm from the top surface. The refractive index of glass is 1.6. Which of the following correctly represents the number of images seen by an observer looking vertically downwards from air onto the top surface?
- A Only one image is seen at a depth of 5 cm
- B Multiple images are formed due to multiple reflections and refractions
- C Only one image is seen at a depth of 16 cm
- D Two images are seen at depths 5cm and 15 cm
Answer & Solution
Correct Answer
(D) Two images are seen at depths 5cm and 15 cm
Step-by-step Solution
Detailed explanation
The observer will see two primary images of the air bubble. The first image is formed by the direct refraction of light from the bubble through the top surface of the glass slab. Real depth of the bubble from the top surface, \(x_1 = 8\) cm. Apparent depth of the first image,…
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