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.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Optics
665 free Optics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 11 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Optics questions
In Newton ring apparatus, at the point of contact of the lens and glass plate, the additional path difference introduced is:
In Michelson's Experiment, the formula to calculate the speed of light is:
The extent of bonding of a light ray after passing through prism depends upon:
Which one of the following lights travels fastest in optical fibers?
The property of bending of light around an obstacle and spreading of light waves into a geometric shadow of an obstacle is called:
The value of the least distance of distinct vision or near point is _ for a normal human eye.