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Chapter 5: Q18DQ (page 1104)

For the old 鈥渞abbit-ear鈥� style TV antennas, it鈥檚 possible to alter the quality of reception considerably simply by changing the orientation of the antenna. Why?

Short Answer

Expert verified

The critical angles are 38.12潞 and 55.37潞 for glass-air and glass-water interface respectively.

Step by step solution

01

(a) Concept of critical angle.

When light travels from a denser to the rarer medium, the angle of incidence in the denser medium for which the angle of refraction is 90潞 causing the refracted light to graze the boundary separating the two medium is known as the critical angle.

02

(b) Explanation of the argument.

The refractive indices,

nglass=1.62,nair=1andnglass=1.333

Now,

The expression of critical angle is,

胃c=arcsinn1n2

For glass-air interface,

胃c=arcsinnairnglass=arcsin11.62=381.2

For glass-water interface,

胃c=arcsinnwaternglass=arcsin1.3331.62=55.37

Thus, the critical angles are 38.12潞 and 55.37潞.

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Most popular questions from this chapter

When a converging lens is immersed in water, does itsfocal length increase or decrease in comparison with the value inair? Explain.

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