To increase both the resolving power and magnifying power of...

Name: Problem 86, Chapter 24: Objective Physics for NEET
Uploaded: 2021-09-09T10:13:04-08:00
Duration: 2 min 16 s
Channel: Prem Bijarniya
Description: To increase both the resolving power and magnifying power of a telescope (a) wavelength of light has to be decreased (b) aperture of the objective has to be increased (c) focal length of the objective has to be increased (d) both the focal length and aperture of the objective have to be increased

To increase both the resolving power and magnifying power of a telescope (a) wavelength of light has to be decreased (b) aperture of the objective has to be increased (c) focal length of the objective has to be increased (d) both the focal length and aperture of the objective have to be increased

To increase both the resolving power and magnifying power of a telescope
(a) wavelength of light has to be decreased
(b) aperture of the objective has to be increased
(c) focal length of the objective has to be increased
(d) both the focal length and aperture of the objective have to be increased

Key Concepts

Focal Length

Focal length in the context of telescopes refers to the distance at which parallel rays of light are brought to a focus. The focal length of the objective influences the magnifying power when used in combination with the eyepiece, as a longer focal length extends the image scale. However, adjustments to the focal length can also affect the field of view and brightness of the image.

Aperture

The aperture of a telescope is the diameter of its primary light-gathering element, whether it is a lens or a mirror. A larger aperture not only gathers more light, allowing fainter objects to be seen, but it also reduces the effects of diffraction, thereby improving the telescope’s resolving power. Aperture size is a critical factor in overall telescope performance.

Wavelength

Wavelength is the distance between consecutive peaks of a light wave and is a fundamental property of light. In telescopic observations, shorter wavelengths typically result in better resolving power, since the ability to distinguish fine detail is tied to the ratio of wavelength to aperture size. This principle underscores the importance of the light’s wavelength in achieving higher resolution in astronomical imaging.

Resolving Power

Resolving power is the ability of an optical instrument to distinguish fine details and separate two points that are close together. In the context of telescopes, resolving power is influenced by the diameter of the objective lens or mirror and the wavelength of the observed light, following the diffraction limit. Improvements in resolving power allow astronomers to discern smaller structures in distant celestial objects.

Magnifying Power

Magnifying power refers to the capability of a telescope to enlarge the appearance of an object. It is typically determined by the ratio of the focal length of the objective lens or mirror to the focal length of the eyepiece. Increasing magnification makes distant objects appear larger, but it must be balanced with the resolving power to ensure that details are not lost.

Transcript

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