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UPSC 1999: Consider the following statements: I. If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is. II. If a person under water looks at a coin above the water surface, the coin will appear to be at a higher level than it really is. Which of the above statements is/are correct?
(a)I and II
(b)I alone
(c)II alone
(d)Neither I nor II
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Not attemptedCorrect Answer: (a) I and II
When light passes from water (denser) to air (rarer), rays bend away from the normal, so a submerged coin looks nearer (shallower) than its real depth. Conversely, for an observer in water, rays from a coin in air bend towards the normal on entering water; extrapolating these rays makes the coin appear farther/higher than its actual position. Therefore both statements I and II are correct. ([edurev.in](https://edurev.in/t/203049/Physics-Solved-Questions--1995-2020--2))
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Frequently Asked Questions
What is the correct answer to this UPSC 1999 Science & Technology question?▼
The correct answer is option (a): I and II. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1999, GS Paper 1, as Question 116. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.