In the case of a grafting spectrometer, the resolving power 'R' of the grating is defined as:
Correct answer: A. λ / Δλ
- A. λ / Δλ
- B. λ / D
- C. λ / λ1
- D. N x m
Explanation
The resolving power 'R' of a grating is defined by the formula R = λ / Δλ, where 'λ' is the wavelength and 'Δλ' is the smallest difference in wavelength that can be resolved. This expression shows how well the grating can distinguish between two closely spaced wavelengths, making Option A correct. Option B refers to the minimum angle of resolution, not resolving power. Option C is incorrect as it does not relate to resolving power. Option D, though an expression related to resolving power, describes the product of the number of lines and spectral order, which is not what the question is looking for.
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About Optics
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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