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Physics · PYQ NEET UG 2021

हिन्दी

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:

  1. a large aperture contributes to the quality and visibility of the images.
  2. a large area of the objective ensures better light gathering power.
  3. a large aperture provides a better resolution.
  4. all of the above.

Correct answer · Option 4

all of the above.

Explanation

A large aperture objective provides high light gathering power, better resolution, and improves image quality.

Related questions

An infinitely long straight conductor carries a current of \( 5\text{ A} \) as shown. An electron is moving with a speed of \( 10^5\text{ m/s} \) parallel to the conductor. The perpendicular distance between the electron and the conductor is \( 20\text{ cm} \) at an instant. Calculate the magnitude of the force experienced by the electron at that instant.→The half-life of a radioactive nuclide is \( 100\text{ hours} \). The fraction of original activity that will remain after \( 150\text{ hours} \) would be:→Match List-I with List-II: List-I List-II A Drift Velocity P \( \frac{m}{ne^2\rho} \) B Electrical Resistivity Q \( nev_d \) C Relaxation Period R \( \frac{eE}{m}\tau \) D Current Density S \( \frac{E}{J} \)→In the product \( \vec{F} = q(\vec{v} \times \vec{B}) = qv \times (B_1\hat{i} + B_2\hat{j} + B_3\hat{k}) \) For \( q = 1 \) and \( \vec{v} = 2\hat{i} + 4\hat{j} + 6\hat{k} \) and \( \vec{F} = 4\hat{i} - 20\hat{j} + 12\hat{k} \) What will be the complete expression for \( \vec{B} \)?→
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