Single Choice

The separation between two microscopic particles is measured PA and PB by two different lights of wavelength 2000 Ao and 3000 Ao respectively, then

APA>PB
BPA
Correct Answer
CPA<3/2PB
DPA=PB

Solution

Resolving limit ( minimum separation ) $$\propto \lambda$$
$$\Rightarrow \dfrac{P_A}{P_B}=\dfrac{2000}{3000}\Rightarrow P_A < P_B$$

SIMILAR QUESTIONS

Optics

In which of the following the final image is erect?

Optics

An optical instrument used for angular magnification has a $$25$$ D objective and a $$20$$ D eyepiece. The tube length is $$25$$ cm when the eye is least strained. Whether it is a microscope or a telescope?

Optics

The limit of resolution of microscope, if the numerical aperture of microscope is $$0.12$$, and the wavelength of light used is $$600\ nm$$, is:

Optics

A student measures the thickness of a human hair by looking at it through a microscope of magnification $$100$$. He makes $$20$$ observations and finds that the average width of the hair in the field of view of the microscope is $$3.5$$ $$mm$$. What is the estimate on the thickness of hair?

Optics

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

Optics

The focal length of objective and eye lens of a microscope are $$4\ cm$$ and $$8\ cm$$ respectively. If the least distance of distinct vision is $$24\ cm$$ and object distance is $$4.5\ cm$$ from the objective lens, then the magnifying power of the microscope will be

Optics

A person using a lens as a simple microscope sees an

Optics

Draw a neat labelled ray diagram to show the formation of image by a magnifying glass. State three characteristics of the image.

Optics

Where is the object placed in reference to the principal focus of a magnifying glass, so as to see its enlarged image? Where is the image obtained?

Contact Details