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Band with for red light of wavelength 64...

Band with for red light of wavelength `6400Å` us 0.32 mm. If red lilght is replaced by blue light of wavelength `4800Å`, then the change in bandwidth will be

A

4800Å

B

6000Å

C

6400Å

D

5600Å

Text Solution

Verified by Experts

The correct Answer is:
B
`beta_(1)=03.322 mm lambda_(1)6400A^(@) lambda_(2) 4800A^(@)`
`beta_(1)-beta_(2)= ?`
`beta prop lambda`
`:. (beta_(2))/(beta_(1))=(lambda_(2))/(lambda_(1))`
`beta_(2)=(4800)/(6400)xx0.32=0.24 mm`
Now, `beta_(1)-beta_(2)=0.32-0.24 mm `
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