Optics Question 455

Question: A fish is vertically below a flying bird moving vertically= down towards water surface. The bird will appear to the fish to be

Options:

A) Moving faster than its speed and also away from the real distance

B) Moving faster than its real speed and nearer than its real distance

C) Moving slower than its real speed and also nearer than its real distance

D) Moving slower than its real speed and away from the real distance

Show Answer

Answer:

Correct Answer: A

Solution:

[a] μ1u+μ2v=μ1μ2R For a plane surface, R=

μ1u+μ2v=0

or μ2v=μ1u

or μv=1u

Or v=μu

Clearly, to the fish, the bird appears farther than its actual distance. Again, dvdt=μdudt

Or. Apparent speed of bird = refractive index × Actual speed of bird



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक