The resolving power of an astronomical telescope can be significantly increased by:
A. Increasing the aperture (diameter) of the objective lens.
B. Using light of a longer wavelength.
C. Increasing the focal length of the objective lens.
D. Decreasing the focal length of the eyepiece.
Answer: Option A
Solution (By JKExamLibrary)
Resolving power is a telescope's ability to distinguish closely spaced objects (like double stars) as separate. It is proportional to D / lambda, where D is the diameter (aperture) of the objective lens and lambda is the wavelength of light. Increasing the aperture D directly and strictly increases the resolving power.
Explanation:
Kepler's Second Law states that the line joining a planet to the Sun sweeps out equal areas in equal intervals of time (areal velocity is constant). Because the gravitational force is a central force (acting strictly along the radius vector), it exerts zero torque on the planet. When net torque is zero, angular momentum is strictly conserved.
Explanation:
A speedometer shows the speed of a vehicle at a particular instant in time. Speed is a scalar quantity (magnitude only, no direction). Therefore, it measures instantaneous speed. If it were measuring velocity, it would also need to display the car's current compass direction of travel at every moment.
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