NEET Physics Question - Wave Optics

Assertion (A): Resolving power of a microscope is different for different colours of illuminating light.

Reason (R): Resolving power of a microscope is directly proportional to the wavelength of illuminating light.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

The resolving power (RP) of a microscope is given by \(RP = \frac{2NA}{1.22\lambda}\), where \(NA\) is the numerical aperture and \(\lambda\) is the wavelength. Since RP is inversely proportional to \(\lambda\), it will be different for different colours (different wavelengths). Reason (R) states direct proportionality, which is false.

Rankers Physics

Microscope Resolving Power

Solution:

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