Question

3. A grating has 15 cm of the surface with 6000 mes/cm. The resolving power of the
grating of the first order is
(A) 80,000
(B) 90,000
(C) 70,000 (D) 88,000​

Answer 1

Answer:

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Answer 2

Answer:

The resolving power of grating of the first order is 90,000(B).

Explanation:

Resolving power of the grating=nN     (1)

where,

n=order of diffraction

N=total number of ruling on the grating

as per the question,

15 cm of distance on  the surface of the grating has 6000 lines/cm      (2)

and order of diffraction(n) given in the question is 1

then we only have to find N

N=distance on the grating x lines/distance

now by substituting the values of equation 2 we get:

N= 15cm x 6000 lines/cm=90,000

now let's place  the values in equation 1,

resolving power=1 x 90,000=90,000

so, the correct option is (B).